A Blockchain Transaction Graph based Machine Learning ...

[X-POST /r/bitcoin] [PDF] Determining manipulation via 'sock puppet' accounts on the block size debate (on reddit) using machine learning

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Bitcoin Newcomers FAQ - Please read!

Welcome to the /Bitcoin Sticky FAQ

You've probably been hearing a lot about Bitcoin recently and are wondering what's the big deal? Most of your questions should be answered by the resources below but if you have additional questions feel free to ask them in the comments.
It all started with the release of the release of Satoshi Nakamoto's whitepaper however that will probably go over the head of most readers so we recommend the following videos for a good starting point for understanding how bitcoin works and a little about its long term potential:
Some other great resources include Lopp.net, the Princeton crypto series and James D'Angelo's Bitcoin 101 Blackboard series.
Some excellent writing on Bitcoin's value proposition and future can be found at the Satoshi Nakamoto Institute.
Some Bitcoin statistics can be found here and here. Developer resources can be found here. Peer-reviewed research papers can be found here.
Potential upcoming protocol improvements and scaling resources here and here.
The number of times Bitcoin was declared dead by the media can be found here (LOL!)

Key properties of Bitcoin

Where can I buy bitcoins?

Bitcoin.org and BuyBitcoinWorldwide.com are helpful sites for beginners. You can buy or sell any amount of bitcoin (even just a few dollars worth) and there are several easy methods to purchase bitcoin with cash, credit card or bank transfer. Some of the more popular resources are below, also check out the bitcoinity exchange resources for a larger list of options for purchases.
Here is a listing of local ATMs. If you would like your paycheck automatically converted to bitcoin use Bitwage.
Note: Bitcoins are valued at whatever market price people are willing to pay for them in balancing act of supply vs demand. Unlike traditional markets, bitcoin markets operate 24 hours per day, 365 days per year. Preev is a useful site that that shows how much various denominations of bitcoin are worth in different currencies. Alternatively you can just Google "1 bitcoin in (your local currency)".

Securing your bitcoins

With bitcoin you can "Be your own bank" and personally secure your bitcoins OR you can use third party companies aka "Bitcoin banks" which will hold the bitcoins for you.
Note: For increased security, use Two Factor Authentication (2FA) everywhere it is offered, including email!
2FA requires a second confirmation code to access your account making it much harder for thieves to gain access. Google Authenticator and Authy are the two most popular 2FA services, download links are below. Make sure you create backups of your 2FA codes.
Google Auth Authy OTP Auth
Android Android N/A
iOS iOS iOS

Watch out for scams

As mentioned above, Bitcoin is decentralized, which by definition means there is no official website or Twitter handle or spokesperson or CEO. However, all money attracts thieves. This combination unfortunately results in scammers running official sounding names or pretending to be an authority on YouTube or social media. Many scammers throughout the years have claimed to be the inventor of Bitcoin. Websites like bitcoin(dot)com and the btc subreddit are active scams. Almost all altcoins (shitcoins) are marketed heavily with big promises but are really just designed to separate you from your bitcoin. So be careful: any resource, including all linked in this document, may in the future turn evil. Don't trust, verify. Also as they say in our community "Not your keys, not your coins".

Where can I spend bitcoins?

Check out spendabit or bitcoin directory for millions of merchant options. Also you can spend bitcoin anywhere visa is accepted with bitcoin debit cards such as the CashApp card. Some other useful site are listed below.
Store Product
Gyft Gift cards for hundreds of retailers including Amazon, Target, Walmart, Starbucks, Whole Foods, CVS, Lowes, Home Depot, iTunes, Best Buy, Sears, Kohls, eBay, GameStop, etc.
Spendabit, Overstock and The Bitcoin Directory Retail shopping with millions of results
ShakePay Generate one time use Visa cards in seconds
NewEgg and Dell For all your electronics needs
Bitwa.la, Coinbills, Piixpay, Bitbill.eu, Bylls, Coins.ph, Bitrefill, LivingRoomofSatoshi, Coinsfer, and more Bill payment
Menufy, Takeaway and Thuisbezorgd NL Takeout delivered to your door
Expedia, Cheapair, Destinia, Abitsky, SkyTours, the Travel category on Gyft and 9flats For when you need to get away
Cryptostorm, Mullvad, and PIA VPN services
Namecheap, Porkbun Domain name registration
Stampnik Discounted USPS Priority, Express, First-Class mail postage
Coinmap and AirBitz are helpful to find local businesses accepting bitcoins. A good resource for UK residents is at wheretospendbitcoins.co.uk.
There are also lots of charities which accept bitcoin donations.

Merchant Resources

There are several benefits to accepting bitcoin as a payment option if you are a merchant;
If you are interested in accepting bitcoin as a payment method, there are several options available;

Can I mine bitcoin?

Mining bitcoins can be a fun learning experience, but be aware that you will most likely operate at a loss. Newcomers are often advised to stay away from mining unless they are only interested in it as a hobby similar to folding at home. If you want to learn more about mining you can read more here. Still have mining questions? The crew at /BitcoinMining would be happy to help you out.
If you want to contribute to the bitcoin network by hosting the blockchain and propagating transactions you can run a full node using this setup guide. If you would prefer to keep it simple there are several good options. You can view the global node distribution here.

Earning bitcoins

Just like any other form of money, you can also earn bitcoins by being paid to do a job.
Site Description
WorkingForBitcoins, Bitwage, Cryptogrind, Coinality, Bitgigs, /Jobs4Bitcoins, BitforTip, Rein Project Freelancing
Lolli Earn bitcoin when you shop online!
OpenBazaar, Purse.io, Bitify, /Bitmarket, 21 Market Marketplaces
/GirlsGoneBitcoin NSFW Adult services
A-ads, Coinzilla.io Advertising
You can also earn bitcoins by participating as a market maker on JoinMarket by allowing users to perform CoinJoin transactions with your bitcoins for a small fee (requires you to already have some bitcoins.

Bitcoin-Related Projects

The following is a short list of ongoing projects that might be worth taking a look at if you are interested in current development in the bitcoin space.
Project Description
Lightning Network Second layer scaling
Blockstream, Rootstock and Drivechain Sidechains
Hivemind and Augur Prediction markets
Tierion and Factom Records & Titles on the blockchain
BitMarkets, DropZone, Beaver and Open Bazaar Decentralized markets
JoinMarket and Wasabi Wallet CoinJoin implementation
Coinffeine and Bisq Decentralized bitcoin exchanges
Keybase Identity & Reputation management
Abra Global P2P money transmitter network
Bitcore Open source Bitcoin javascript library

Bitcoin Units

One Bitcoin is quite large (hundreds of £/$/€) so people often deal in smaller units. The most common subunits are listed below:
Unit Symbol Value Info
bitcoin BTC 1 bitcoin one bitcoin is equal to 100 million satoshis
millibitcoin mBTC 1,000 per bitcoin used as default unit in recent Electrum wallet releases
bit bit 1,000,000 per bitcoin colloquial "slang" term for microbitcoin (μBTC)
satoshi sat 100,000,000 per bitcoin smallest unit in bitcoin, named after the inventor
For example, assuming an arbitrary exchange rate of $10000 for one Bitcoin, a $10 meal would equal:
For more information check out the Bitcoin units wiki.
Still have questions? Feel free to ask in the comments below or stick around for our weekly Mentor Monday thread. If you decide to post a question in /Bitcoin, please use the search bar to see if it has been answered before, and remember to follow the community rules outlined on the sidebar to receive a better response. The mods are busy helping manage our community so please do not message them unless you notice problems with the functionality of the subreddit.
Note: This is a community created FAQ. If you notice anything missing from the FAQ or that requires clarification you can edit it here and it will be included in the next revision pending approval.
Welcome to the Bitcoin community and the new decentralized economy!
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Dragonchain Great Reddit Scaling Bake-Off Public Proposal

Dragonchain Great Reddit Scaling Bake-Off Public Proposal

Dragonchain Public Proposal TL;DR:

Dragonchain has demonstrated twice Reddit’s entire total daily volume (votes, comments, and posts per Reddit 2019 Year in Review) in a 24-hour demo on an operational network. Every single transaction on Dragonchain is decentralized immediately through 5 levels of Dragon Net, and then secured with combined proof on Bitcoin, Ethereum, Ethereum Classic, and Binance Chain, via Interchain. At the time, in January 2020, the entire cost of the demo was approximately $25K on a single system (transaction fees locked at $0.0001/txn). With current fees (lowest fee $0.0000025/txn), this would cost as little as $625.
Watch Joe walk through the entire proposal and answer questions on YouTube.
This proposal is also available on the Dragonchain blog.

Hello Reddit and Ethereum community!

I’m Joe Roets, Founder & CEO of Dragonchain. When the team and I first heard about The Great Reddit Scaling Bake-Off we were intrigued. We believe we have the solutions Reddit seeks for its community points system and we have them at scale.
For your consideration, we have submitted our proposal below. The team at Dragonchain and I welcome and look forward to your technical questions, philosophical feedback, and fair criticism, to build a scaling solution for Reddit that will empower its users. Because our architecture is unlike other blockchain platforms out there today, we expect to receive many questions while people try to grasp our project. I will answer all questions here in this thread on Reddit, and I've answered some questions in the stream on YouTube.
We have seen good discussions so far in the competition. We hope that Reddit’s scaling solution will emerge from The Great Reddit Scaling Bake-Off and that Reddit will have great success with the implementation.

Executive summary

Dragonchain is a robust open source hybrid blockchain platform that has proven to withstand the passing of time since our inception in 2014. We have continued to evolve to harness the scalability of private nodes, yet take full advantage of the security of public decentralized networks, like Ethereum. We have a live, operational, and fully functional Interchain network integrating Bitcoin, Ethereum, Ethereum Classic, and ~700 independent Dragonchain nodes. Every transaction is secured to Ethereum, Bitcoin, and Ethereum Classic. Transactions are immediately usable on chain, and the first decentralization is seen within 20 seconds on Dragon Net. Security increases further to public networks ETH, BTC, and ETC within 10 minutes to 2 hours. Smart contracts can be written in any executable language, offering full freedom to existing developers. We invite any developer to watch the demo, play with our SDK’s, review open source code, and to help us move forward. Dragonchain specializes in scalable loyalty & rewards solutions and has built a decentralized social network on chain, with very affordable transaction costs. This experience can be combined with the insights Reddit and the Ethereum community have gained in the past couple of months to roll out the solution at a rapid pace.

Response and PoC

In The Great Reddit Scaling Bake-Off post, Reddit has asked for a series of demonstrations, requirements, and other considerations. In this section, we will attempt to answer all of these requests.

Live Demo

A live proof of concept showing hundreds of thousands of transactions
On Jan 7, 2020, Dragonchain hosted a 24-hour live demonstration during which a quarter of a billion (250 million+) transactions executed fully on an operational network. Every single transaction on Dragonchain is decentralized immediately through 5 levels of Dragon Net, and then secured with combined proof on Bitcoin, Ethereum, Ethereum Classic, and Binance Chain, via Interchain. This means that every single transaction is secured by, and traceable to these networks. An attack on this system would require a simultaneous attack on all of the Interchained networks.
24 hours in 4 minutes (YouTube):
24 hours in 4 minutes
The demonstration was of a single business system, and any user is able to scale this further, by running multiple systems simultaneously. Our goals for the event were to demonstrate a consistent capacity greater than that of Visa over an extended time period.
Tooling to reproduce our demo is available here:
https://github.com/dragonchain/spirit-bomb

Source Code

Source code (for on & off-chain components as well tooling used for the PoC). The source code does not have to be shared publicly, but if Reddit decides to use a particular solution it will need to be shared with Reddit at some point.

Scaling

How it works & scales

Architectural Scaling

Dragonchain’s architecture attacks the scalability issue from multiple angles. Dragonchain is a hybrid blockchain platform, wherein every transaction is protected on a business node to the requirements of that business or purpose. A business node may be held completely private or may be exposed or replicated to any level of exposure desired.
Every node has its own blockchain and is independently scalable. Dragonchain established Context Based Verification as its consensus model. Every transaction is immediately usable on a trust basis, and in time is provable to an increasing level of decentralized consensus. A transaction will have a level of decentralization to independently owned and deployed Dragonchain nodes (~700 nodes) within seconds, and full decentralization to BTC and ETH within minutes or hours. Level 5 nodes (Interchain nodes) function to secure all transactions to public or otherwise external chains such as Bitcoin and Ethereum. These nodes scale the system by aggregating multiple blocks into a single Interchain transaction on a cadence. This timing is configurable based upon average fees for each respective chain. For detailed information about Dragonchain’s architecture, and Context Based Verification, please refer to the Dragonchain Architecture Document.

Economic Scaling

An interesting feature of Dragonchain’s network consensus is its economics and scarcity model. Since Dragon Net nodes (L2-L4) are independent staking nodes, deployment to cloud platforms would allow any of these nodes to scale to take on a large percentage of the verification work. This is great for scalability, but not good for the economy, because there is no scarcity, and pricing would develop a downward spiral and result in fewer verification nodes. For this reason, Dragonchain uses TIME as scarcity.
TIME is calculated as the number of Dragons held, multiplied by the number of days held. TIME influences the user’s access to features within the Dragonchain ecosystem. It takes into account both the Dragon balance and length of time each Dragon is held. TIME is staked by users against every verification node and dictates how much of the transaction fees are awarded to each participating node for every block.
TIME also dictates the transaction fee itself for the business node. TIME is staked against a business node to set a deterministic transaction fee level (see transaction fee table below in Cost section). This is very interesting in a discussion about scaling because it guarantees independence for business implementation. No matter how much traffic appears on the entire network, a business is guaranteed to not see an increased transaction fee rate.

Scaled Deployment

Dragonchain uses Docker and Kubernetes to allow the use of best practices traditional system scaling. Dragonchain offers managed nodes with an easy to use web based console interface. The user may also deploy a Dragonchain node within their own datacenter or favorite cloud platform. Users have deployed Dragonchain nodes on-prem on Amazon AWS, Google Cloud, MS Azure, and other hosting platforms around the world. Any executable code, anything you can write, can be written into a smart contract. This flexibility is what allows us to say that developers with no blockchain experience can use any code language to access the benefits of blockchain. Customers have used NodeJS, Python, Java, and even BASH shell script to write smart contracts on Dragonchain.
With Docker containers, we achieve better separation of concerns, faster deployment, higher reliability, and lower response times.
We chose Kubernetes for its self-healing features, ability to run multiple services on one server, and its large and thriving development community. It is resilient, scalable, and automated. OpenFaaS allows us to package smart contracts as Docker images for easy deployment.
Contract deployment time is now bounded only by the size of the Docker image being deployed but remains fast even for reasonably large images. We also take advantage of Docker’s flexibility and its ability to support any language that can run on x86 architecture. Any image, public or private, can be run as a smart contract using Dragonchain.

Flexibility in Scaling

Dragonchain’s architecture considers interoperability and integration as key features. From inception, we had a goal to increase adoption via integration with real business use cases and traditional systems.
We envision the ability for Reddit, in the future, to be able to integrate alternate content storage platforms or other financial services along with the token.
  • LBRY - To allow users to deploy content natively to LBRY
  • MakerDAO to allow users to lend small amounts backed by their Reddit community points.
  • STORJ/SIA to allow decentralized on chain storage of portions of content. These integrations or any other are relatively easy to integrate on Dragonchain with an Interchain implementation.

Cost

Cost estimates (on-chain and off-chain) For the purpose of this proposal, we assume that all transactions are on chain (posts, replies, and votes).
On the Dragonchain network, transaction costs are deterministic/predictable. By staking TIME on the business node (as described above) Reddit can reduce transaction costs to as low as $0.0000025 per transaction.
Dragonchain Fees Table

Getting Started

How to run it
Building on Dragonchain is simple and requires no blockchain experience. Spin up a business node (L1) in our managed environment (AWS), run it in your own cloud environment, or on-prem in your own datacenter. Clear documentation will walk you through the steps of spinning up your first Dragonchain Level 1 Business node.
Getting started is easy...
  1. Download Dragonchain’s dctl
  2. Input three commands into a terminal
  3. Build an image
  4. Run it
More information can be found in our Get started documents.

Architecture
Dragonchain is an open source hybrid platform. Through Dragon Net, each chain combines the power of a public blockchain (like Ethereum) with the privacy of a private blockchain.
Dragonchain organizes its network into five separate levels. A Level 1, or business node, is a totally private blockchain only accessible through the use of public/private keypairs. All business logic, including smart contracts, can be executed on this node directly and added to the chain.
After creating a block, the Level 1 business node broadcasts a version stripped of sensitive private data to Dragon Net. Three Level 2 Validating nodes validate the transaction based on guidelines determined from the business. A Level 3 Diversity node checks that the level 2 nodes are from a diverse array of locations. A Level 4 Notary node, hosted by a KYC partner, then signs the validation record received from the Level 3 node. The transaction hash is ledgered to the Level 5 public chain to take advantage of the hash power of massive public networks.
Dragon Net can be thought of as a “blockchain of blockchains”, where every level is a complete private blockchain. Because an L1 can send to multiple nodes on a single level, proof of existence is distributed among many places in the network. Eventually, proof of existence reaches level 5 and is published on a public network.

API Documentation

APIs (on chain & off)

SDK Source

Nobody’s Perfect

Known issues or tradeoffs
  • Dragonchain is open source and even though the platform is easy enough for developers to code in any language they are comfortable with, we do not have so large a developer community as Ethereum. We would like to see the Ethereum developer community (and any other communities) become familiar with our SDK’s, our solutions, and our platform, to unlock the full potential of our Ethereum Interchain. Long ago we decided to prioritize both Bitcoin and Ethereum Interchains. We envision an ecosystem that encompasses different projects to give developers the ability to take full advantage of all the opportunities blockchain offers to create decentralized solutions not only for Reddit but for all of our current platforms and systems. We believe that together we will take the adoption of blockchain further. We currently have additional Interchain with Ethereum Classic. We look forward to Interchain with other blockchains in the future. We invite all blockchains projects who believe in decentralization and security to Interchain with Dragonchain.
  • While we only have 700 nodes compared to 8,000 Ethereum and 10,000 Bitcoin nodes. We harness those 18,000 nodes to scale to extremely high levels of security. See Dragonchain metrics.
  • Some may consider the centralization of Dragonchain’s business nodes as an issue at first glance, however, the model is by design to protect business data. We do not consider this a drawback as these nodes can make any, none, or all data public. Depending upon the implementation, every subreddit could have control of its own business node, for potential business and enterprise offerings, bringing new alternative revenue streams to Reddit.

Costs and resources

Summary of cost & resource information for both on-chain & off-chain components used in the PoC, as well as cost & resource estimates for further scaling. If your PoC is not on mainnet, make note of any mainnet caveats (such as congestion issues).
Every transaction on the PoC system had a transaction fee of $0.0001 (one-hundredth of a cent USD). At 256MM transactions, the demo cost $25,600. With current operational fees, the same demonstration would cost $640 USD.
For the demonstration, to achieve throughput to mimic a worldwide payments network, we modeled several clients in AWS and 4-5 business nodes to handle the traffic. The business nodes were tuned to handle higher throughput by adjusting memory and machine footprint on AWS. This flexibility is valuable to implementing a system such as envisioned by Reddit. Given that Reddit’s daily traffic (posts, replies, and votes) is less than half that of our demo, we would expect that the entire Reddit system could be handled on 2-5 business nodes using right-sized containers on AWS or similar environments.
Verification was accomplished on the operational Dragon Net network with over 700 independently owned verification nodes running around the world at no cost to the business other than paid transaction fees.

Requirements

Scaling

This PoC should scale to the numbers below with minimal costs (both on & off-chain). There should also be a clear path to supporting hundreds of millions of users.
Over a 5 day period, your scaling PoC should be able to handle:
*100,000 point claims (minting & distributing points) *25,000 subscriptions *75,000 one-off points burning *100,000 transfers
During Dragonchain’s 24 hour demo, the above required numbers were reached within the first few minutes.
Reddit’s total activity is 9000% more than Ethereum’s total transaction level. Even if you do not include votes, it is still 700% more than Ethereum’s current volume. Dragonchain has demonstrated that it can handle 250 million transactions a day, and it’s architecture allows for multiple systems to work at that level simultaneously. In our PoC, we demonstrate double the full capacity of Reddit, and every transaction was proven all the way to Bitcoin and Ethereum.
Reddit Scaling on Ethereum

Decentralization

Solutions should not depend on any single third-party provider. We prefer solutions that do not depend on specific entities such as Reddit or another provider, and solutions with no single point of control or failure in off-chain components but recognize there are numerous trade-offs to consider
Dragonchain’s architecture calls for a hybrid approach. Private business nodes hold the sensitive data while the validation and verification of transactions for the business are decentralized within seconds and secured to public blockchains within 10 minutes to 2 hours. Nodes could potentially be controlled by owners of individual subreddits for more organic decentralization.
  • Billing is currently centralized - there is a path to federation and decentralization of a scaled billing solution.
  • Operational multi-cloud
  • Operational on-premises capabilities
  • Operational deployment to any datacenter
  • Over 700 independent Community Verification Nodes with proof of ownership
  • Operational Interchain (Interoperable to Bitcoin, Ethereum, and Ethereum Classic, open to more)

Usability Scaling solutions should have a simple end user experience.

Users shouldn't have to maintain any extra state/proofs, regularly monitor activity, keep track of extra keys, or sign anything other than their normal transactions
Dragonchain and its customers have demonstrated extraordinary usability as a feature in many applications, where users do not need to know that the system is backed by a live blockchain. Lyceum is one of these examples, where the progress of academy courses is being tracked, and successful completion of courses is rewarded with certificates on chain. Our @Save_The_Tweet bot is popular on Twitter. When used with one of the following hashtags - #please, #blockchain, #ThankYou, or #eternalize the tweet is saved through Eternal to multiple blockchains. A proof report is available for future reference. Other examples in use are DEN, our decentralized social media platform, and our console, where users can track their node rewards, view their TIME, and operate a business node.
Examples:

Transactions complete in a reasonable amount of time (seconds or minutes, not hours or days)
All transactions are immediately usable on chain by the system. A transaction begins the path to decentralization at the conclusion of a 5-second block when it gets distributed across 5 separate community run nodes. Full decentralization occurs within 10 minutes to 2 hours depending on which interchain (Bitcoin, Ethereum, or Ethereum Classic) the transaction hits first. Within approximately 2 hours, the combined hash power of all interchained blockchains secures the transaction.

Free to use for end users (no gas fees, or fixed/minimal fees that Reddit can pay on their behalf)
With transaction pricing as low as $0.0000025 per transaction, it may be considered reasonable for Reddit to cover transaction fees for users.
All of Reddit's Transactions on Blockchain (month)
Community points can be earned by users and distributed directly to their Reddit account in batch (as per Reddit minting plan), and allow users to withdraw rewards to their Ethereum wallet whenever they wish. Withdrawal fees can be paid by either user or Reddit. This model has been operating inside the Dragonchain system since 2018, and many security and financial compliance features can be optionally added. We feel that this capability greatly enhances user experience because it is seamless to a regular user without cryptocurrency experience, yet flexible to a tech savvy user. With regard to currency or token transactions, these would occur on the Reddit network, verified to BTC and ETH. These transactions would incur the $0.0000025 transaction fee. To estimate this fee we use the monthly active Reddit users statista with a 60% adoption rate and an estimated 10 transactions per month average resulting in an approximate $720 cost across the system. Reddit could feasibly incur all associated internal network charges (mining/minting, transfer, burn) as these are very low and controllable fees.
Reddit Internal Token Transaction Fees

Reddit Ethereum Token Transaction Fees
When we consider further the Ethereum fees that might be incurred, we have a few choices for a solution.
  1. Offload all Ethereum transaction fees (user withdrawals) to interested users as they wish to withdraw tokens for external use or sale.
  2. Cover Ethereum transaction fees by aggregating them on a timed schedule. Users would request withdrawal (from Reddit or individual subreddits), and they would be transacted on the Ethereum network every hour (or some other schedule).
  3. In a combination of the above, customers could cover aggregated fees.
  4. Integrate with alternate Ethereum roll up solutions or other proposals to aggregate minting and distribution transactions onto Ethereum.

Bonus Points

Users should be able to view their balances & transactions via a blockchain explorer-style interface
From interfaces for users who have no knowledge of blockchain technology to users who are well versed in blockchain terms such as those present in a typical block explorer, a system powered by Dragonchain has flexibility on how to provide balances and transaction data to users. Transactions can be made viewable in an Eternal Proof Report, which displays raw data along with TIME staking information and traceability all the way to Bitcoin, Ethereum, and every other Interchained network. The report shows fields such as transaction ID, timestamp, block ID, multiple verifications, and Interchain proof. See example here.
Node payouts within the Dragonchain console are listed in chronological order and can be further seen in either Dragons or USD. See example here.
In our social media platform, Dragon Den, users can see, in real-time, their NRG and MTR balances. See example here.
A new influencer app powered by Dragonchain, Raiinmaker, breaks down data into a user friendly interface that shows coin portfolio, redeemed rewards, and social scores per campaign. See example here.

Exiting is fast & simple
Withdrawing funds on Dragonchain’s console requires three clicks, however, withdrawal scenarios with more enhanced security features per Reddit’s discretion are obtainable.

Interoperability Compatibility with third party apps (wallets/contracts/etc) is necessary.
Proven interoperability at scale that surpasses the required specifications. Our entire platform consists of interoperable blockchains connected to each other and traditional systems. APIs are well documented. Third party permissions are possible with a simple smart contract without the end user being aware. No need to learn any specialized proprietary language. Any code base (not subsets) is usable within a Docker container. Interoperable with any blockchain or traditional APIs. We’ve witnessed relatively complex systems built by engineers with no blockchain or cryptocurrency experience. We’ve also demonstrated the creation of smart contracts within minutes built with BASH shell and Node.js. Please see our source code and API documentation.

Scaling solutions should be extensible and allow third parties to build on top of it Open source and extensible
APIs should be well documented and stable

Documentation should be clear and complete
For full documentation, explore our docs, SDK’s, Github repo’s, architecture documents, original Disney documentation, and other links or resources provided in this proposal.

Third-party permissionless integrations should be possible & straightforward Smart contracts are Docker based, can be written in any language, use full language (not subsets), and can therefore be integrated with any system including traditional system APIs. Simple is better. Learning an uncommon or proprietary language should not be necessary.
Advanced knowledge of mathematics, cryptography, or L2 scaling should not be required. Compatibility with common utilities & toolchains is expected.
Dragonchain business nodes and smart contracts leverage Docker to allow the use of literally any language or executable code. No proprietary language is necessary. We’ve witnessed relatively complex systems built by engineers with no blockchain or cryptocurrency experience. We’ve also demonstrated the creation of smart contracts within minutes built with BASH shell and Node.js.

Bonus

Bonus Points: Show us how it works. Do you have an idea for a cool new use case for Community Points? Build it!

TIME

Community points could be awarded to Reddit users based upon TIME too, whereas the longer someone is part of a subreddit, the more community points someone naturally gained, even if not actively commenting or sharing new posts. A daily login could be required for these community points to be credited. This grants awards to readers too and incentivizes readers to create an account on Reddit if they browse the website often. This concept could also be leveraged to provide some level of reputation based upon duration and consistency of contribution to a community subreddit.

Dragon Den

Dragonchain has already built a social media platform that harnesses community involvement. Dragon Den is a decentralized community built on the Dragonchain blockchain platform. Dragon Den is Dragonchain’s answer to fake news, trolling, and censorship. It incentivizes the creation and evaluation of quality content within communities. It could be described as being a shareholder of a subreddit or Reddit in its entirety. The more your subreddit is thriving, the more rewarding it will be. Den is currently in a public beta and in active development, though the real token economy is not live yet. There are different tokens for various purposes. Two tokens are Lair Ownership Rights (LOR) and Lair Ownership Tokens (LOT). LOT is a non-fungible token for ownership of a specific Lair. LOT will only be created and converted from LOR.
Energy (NRG) and Matter (MTR) work jointly. Your MTR determines how much NRG you receive in a 24-hour period. Providing quality content, or evaluating content will earn MTR.

Security. Users have full ownership & control of their points.
All community points awarded based upon any type of activity or gift, are secured and provable to all Interchain networks (currently BTC, ETH, ETC). Users are free to spend and withdraw their points as they please, depending on the features Reddit wants to bring into production.

Balances and transactions cannot be forged, manipulated, or blocked by Reddit or anyone else
Users can withdraw their balance to their ERC20 wallet, directly through Reddit. Reddit can cover the fees on their behalf, or the user covers this with a portion of their balance.

Users should own their points and be able to get on-chain ERC20 tokens without permission from anyone else
Through our console users can withdraw their ERC20 rewards. This can be achieved on Reddit too. Here is a walkthrough of our console, though this does not show the quick withdrawal functionality, a user can withdraw at any time. https://www.youtube.com/watch?v=aNlTMxnfVHw

Points should be recoverable to on-chain ERC20 tokens even if all third-parties involved go offline
If necessary, signed transactions from the Reddit system (e.g. Reddit + Subreddit) can be sent to the Ethereum smart contract for minting.

A public, third-party review attesting to the soundness of the design should be available
To our knowledge, at least two large corporations, including a top 3 accounting firm, have conducted positive reviews. These reviews have never been made public, as Dragonchain did not pay or contract for these studies to be released.

Bonus points
Public, third-party implementation review available or in progress
See above

Compatibility with HSMs & hardware wallets
For the purpose of this proposal, all tokenization would be on the Ethereum network using standard token contracts and as such, would be able to leverage all hardware wallet and Ethereum ecosystem services.

Other Considerations

Minting/distributing tokens is not performed by Reddit directly
This operation can be automated by smart contract on Ethereum. Subreddits can if desired have a role to play.

One off point burning, as well as recurring, non-interactive point burning (for subreddit memberships) should be possible and scalable
This is possible and scalable with interaction between Dragonchain Reddit system and Ethereum token contract(s).

Fully open-source solutions are strongly preferred
Dragonchain is fully open source (see section on Disney release after conclusion).

Conclusion

Whether it is today, or in the future, we would like to work together to bring secure flexibility to the highest standards. It is our hope to be considered by Ethereum, Reddit, and other integrative solutions so we may further discuss the possibilities of implementation. In our public demonstration, 256 million transactions were handled in our operational network on chain in 24 hours, for the low cost of $25K, which if run today would cost $625. Dragonchain’s interoperable foundation provides the atmosphere necessary to implement a frictionless community points system. Thank you for your consideration of our proposal. We look forward to working with the community to make something great!

Disney Releases Blockchain Platform as Open Source

The team at Disney created the Disney Private Blockchain Platform. The system was a hybrid interoperable blockchain platform for ledgering and smart contract development geared toward solving problems with blockchain adoption and usability. All objective evaluation would consider the team’s output a success. We released a list of use cases that we explored in some capacity at Disney, and our input on blockchain standardization as part of our participation in the W3C Blockchain Community Group.
https://lists.w3.org/Archives/Public/public-blockchain/2016May/0052.html

Open Source

In 2016, Roets proposed to release the platform as open source to spread the technology outside of Disney, as others within the W3C group were interested in the solutions that had been created inside of Disney.
Following a long process, step by step, the team met requirements for release. Among the requirements, the team had to:
  • Obtain VP support and approval for the release
  • Verify ownership of the software to be released
  • Verify that no proprietary content would be released
  • Convince the organization that there was a value to the open source community
  • Convince the organization that there was a value to Disney
  • Offer the plan for ongoing maintenance of the project outside of Disney
  • Itemize competing projects
  • Verify no conflict of interest
  • Preferred license
  • Change the project name to not use the name Disney, any Disney character, or any other associated IP - proposed Dragonchain - approved
  • Obtain legal approval
  • Approval from corporate, parks, and other business units
  • Approval from multiple Disney patent groups Copyright holder defined by Disney (Disney Connected and Advanced Technologies)
  • Trademark searches conducted for the selected name Dragonchain
  • Obtain IT security approval
  • Manual review of OSS components conducted
  • OWASP Dependency and Vulnerability Check Conducted
  • Obtain technical (software) approval
  • Offer management, process, and financial plans for the maintenance of the project.
  • Meet list of items to be addressed before release
  • Remove all Disney project references and scripts
  • Create a public distribution list for email communications
  • Remove Roets’ direct and internal contact information
  • Create public Slack channel and move from Disney slack channels
  • Create proper labels for issue tracking
  • Rename internal private Github repository
  • Add informative description to Github page
  • Expand README.md with more specific information
  • Add information beyond current “Blockchains are Magic”
  • Add getting started sections and info on cloning/forking the project
  • Add installation details
  • Add uninstall process
  • Add unit, functional, and integration test information
  • Detail how to contribute and get involved
  • Describe the git workflow that the project will use
  • Move to public, non-Disney git repository (Github or Bitbucket)
  • Obtain Disney Open Source Committee approval for release
On top of meeting the above criteria, as part of the process, the maintainer of the project had to receive the codebase on their own personal email and create accounts for maintenance (e.g. Github) with non-Disney accounts. Given the fact that the project spanned multiple business units, Roets was individually responsible for its ongoing maintenance. Because of this, he proposed in the open source application to create a non-profit organization to hold the IP and maintain the project. This was approved by Disney.
The Disney Open Source Committee approved the application known as OSSRELEASE-10, and the code was released on October 2, 2016. Disney decided to not issue a press release.
Original OSSRELASE-10 document

Dragonchain Foundation

The Dragonchain Foundation was created on January 17, 2017. https://den.social/l/Dragonchain/24130078352e485d96d2125082151cf0/dragonchain-and-disney/
submitted by j0j0r0 to ethereum [link] [comments]

Scaling Reddit Community Points with Arbitrum Rollup: a piece of cake

Scaling Reddit Community Points with Arbitrum Rollup: a piece of cake
https://preview.redd.it/b80c05tnb9e51.jpg?width=2550&format=pjpg&auto=webp&s=850282c1a3962466ed44f73886dae1c8872d0f31
Submitted for consideration to The Great Reddit Scaling Bake-Off
Baked by the pastry chefs at Offchain Labs
Please send questions or comments to [[email protected] ](mailto:[email protected])
1. Overview
We're excited to submit Arbitrum Rollup for consideration to The Great Reddit Scaling Bake-Off. Arbitrum Rollup is the only Ethereum scaling solution that supports arbitrary smart contracts without compromising on Ethereum's security or adding points of centralization. For Reddit, this means that Arbitrum can not only scale the minting and transfer of Community Points, but it can foster a creative ecosystem built around Reddit Community Points enabling points to be used in a wide variety of third party applications. That's right -- you can have your cake and eat it too!
Arbitrum Rollup isn't just Ethereum-style. Its Layer 2 transactions are byte-for-byte identical to Ethereum, which means Ethereum users can continue to use their existing addresses and wallets, and Ethereum developers can continue to use their favorite toolchains and development environments out-of-the-box with Arbitrum. Coupling Arbitrum’s tooling-compatibility with its trustless asset interoperability, Reddit not only can scale but can onboard the entire Ethereum community at no cost by giving them the same experience they already know and love (well, certainly know).
To benchmark how Arbitrum can scale Reddit Community Points, we launched the Reddit contracts on an Arbitrum Rollup chain. Since Arbitrum provides full Solidity support, we didn't have to rewrite the Reddit contracts or try to mimic their functionality using an unfamiliar paradigm. Nope, none of that. We launched the Reddit contracts unmodified on Arbitrum Rollup complete with support for minting and distributing points. Like every Arbitrum Rollup chain, the chain included a bridge interface in which users can transfer Community Points or any other asset between the L1 and L2 chains. Arbitrum Rollup chains also support dynamic contract loading, which would allow third-party developers to launch custom ecosystem apps that integrate with Community Points on the very same chain that runs the Reddit contracts.
1.1 Why Ethereum
Perhaps the most exciting benefit of distributing Community Points using a blockchain is the ability to seamlessly port points to other applications and use them in a wide variety of contexts. Applications may include simple transfers such as a restaurant that allows Redditors to spend points on drinks. Or it may include complex smart contracts -- such as placing Community Points as a wager for a multiparty game or as collateral in a financial contract.
The common denominator between all of the fun uses of Reddit points is that it needs a thriving ecosystem of both users and developers, and the Ethereum blockchain is perhaps the only smart contract platform with significant adoption today. While many Layer 1 blockchains boast lower cost or higher throughput than the Ethereum blockchain, more often than not, these attributes mask the reality of little usage, weaker security, or both.
Perhaps another platform with significant usage will rise in the future. But today, Ethereum captures the mindshare of the blockchain community, and for Community Points to provide the most utility, the Ethereum blockchain is the natural choice.
1.2 Why Arbitrum
While Ethereum's ecosystem is unmatched, the reality is that fees are high and capacity is too low to support the scale of Reddit Community Points. Enter Arbitrum. Arbitrum Rollup provides all of the ecosystem benefits of Ethereum, but with orders of magnitude more capacity and at a fraction of the cost of native Ethereum smart contracts. And most of all, we don't change the experience from users. They continue to use the same wallets, addresses, languages, and tools.
Arbitrum Rollup is not the only solution that can scale payments, but it is the only developed solution that can scale both payments and arbitrary smart contracts trustlessly, which means that third party users can build highly scalable add-on apps that can be used without withdrawing money from the Rollup chain. If you believe that Reddit users will want to use their Community Points in smart contracts--and we believe they will--then it makes the most sense to choose a single scaling solution that can support the entire ecosystem, eliminating friction for users.
We view being able to run smart contracts in the same scaling solution as fundamentally critical since if there's significant demand in running smart contracts from Reddit's ecosystem, this would be a load on Ethereum and would itself require a scaling solution. Moreover, having different scaling solutions for the minting/distribution/spending of points and for third party apps would be burdensome for users as they'd have to constantly shuffle their Points back and forth.
2. Arbitrum at a glance
Arbitrum Rollup has a unique value proposition as it offers a combination of features that no other scaling solution achieves. Here we highlight its core attributes.
Decentralized. Arbitrum Rollup is as decentralized as Ethereum. Unlike some other Layer 2 scaling projects, Arbitrum Rollup doesn't have any centralized components or centralized operators who can censor users or delay transactions. Even in non-custodial systems, centralized components provide a risk as the operators are generally incentivized to increase their profit by extracting rent from users often in ways that severely degrade user experience. Even if centralized operators are altruistic, centralized components are subject to hacking, coercion, and potential liability.
Massive Scaling. Arbitrum achieves order of magnitude scaling over Ethereum's L1 smart contracts. Our software currently supports 453 transactions-per-second for basic transactions (at 1616 Ethereum gas per tx). We have a lot of room left to optimize (e.g. aggregating signatures), and over the next several months capacity will increase significantly. As described in detail below, Arbitrum can easily support and surpass Reddit's anticipated initial load, and its capacity will continue to improve as Reddit's capacity needs grow.
Low cost. The cost of running Arbitrum Rollup is quite low compared to L1 Ethereum and other scaling solutions such as those based on zero-knowledge proofs. Layer 2 fees are low, fixed, and predictable and should not be overly burdensome for Reddit to cover. Nobody needs to use special equipment or high-end machines. Arbitrum requires validators, which is a permissionless role that can be run on any reasonable on-line machine. Although anybody can act as a validator, in order to protect against a “tragedy of the commons” and make sure reputable validators are participating, we support a notion of “invited validators” that are compensated for their costs. In general, users pay (low) fees to cover the invited validators’ costs, but we imagine that Reddit may cover this cost for its users. See more on the costs and validator options below.
Ethereum Developer Experience. Not only does Arbitrum support EVM smart contracts, but the developer experience is identical to that of L1 Ethereum contracts and fully compatible with Ethereum tooling. Developers can port existing Solidity apps or write new ones using their favorite and familiar toolchains (e.g. Truffle, Buidler). There are no new languages or coding paradigms to learn.
Ethereum wallet compatibility. Just as in Ethereum, Arbitrum users need only hold keys, but do not have to store any coin history or additional data to protect or access their funds. Since Arbitrum transactions are semantically identical to Ethereum L1 transactions, existing Ethereum users can use their existing Ethereum keys with their existing wallet software such as Metamask.
Token interoperability. Users can easily transfer their ETH, ERC-20 and ERC-721 tokens between Ethereum and the Arbitrum Rollup chain. As we explain in detail below, it is possible to mint tokens in L2 that can subsequently be withdrawn and recognized by the L1 token contract.
Fast finality. Transactions complete with the same finality time as Ethereum L1 (and it's possible to get faster finality guarantees by trading away trust assumptions; see the Arbitrum Rollup whitepaper for details).
Non-custodial. Arbitrum Rollup is a non-custodial scaling solution, so users control their funds/points and neither Reddit nor anyone else can ever access or revoke points held by users.
Censorship Resistant. Since it's completely decentralized, and the Arbitrum protocol guarantees progress trustlessly, Arbitrum Rollup is just as censorship-proof as Ethereum.
Block explorer. The Arbitrum Rollup block explorer allows users to view and analyze transactions on the Rollup chain.
Limitations
Although this is a bake-off, we're not going to sugar coat anything. Arbitrum Rollup, like any Optimistic Rollup protocol, does have one limitation, and that's the delay on withdrawals.
As for the concrete length of the delay, we've done a good deal of internal modeling and have blogged about this as well. Our current modeling suggests a 3-hour delay is sufficient (but as discussed in the linked post there is a tradeoff space between the length of the challenge period and the size of the validators’ deposit).
Note that this doesn't mean that the chain is delayed for three hours. Arbitrum Rollup supports pipelining of execution, which means that validators can keep building new states even while previous ones are “in the pipeline” for confirmation. As the challenge delays expire for each update, a new state will be confirmed (read more about this here).
So activity and progress on the chain are not delayed by the challenge period. The only thing that's delayed is the consummation of withdrawals. Recall though that any single honest validator knows immediately (at the speed of L1 finality) which state updates are correct and can guarantee that they will eventually be confirmed, so once a valid withdrawal has been requested on-chain, every honest party knows that the withdrawal will definitely happen. There's a natural place here for a liquidity market in which a validator (or someone who trusts a validator) can provide withdrawal loans for a small interest fee. This is a no-risk business for them as they know which withdrawals will be confirmed (and can force their confirmation trustlessly no matter what anyone else does) but are just waiting for on-chain finality.
3. The recipe: How Arbitrum Rollup works
For a description of the technical components of Arbitrum Rollup and how they interact to create a highly scalable protocol with a developer experience that is identical to Ethereum, please refer to the following documents:
Arbitrum Rollup Whitepaper
Arbitrum academic paper (describes a previous version of Arbitrum)
4. Developer docs and APIs
For full details about how to set up and interact with an Arbitrum Rollup chain or validator, please refer to our developer docs, which can be found at https://developer.offchainlabs.com/.
Note that the Arbitrum version described on that site is older and will soon be replaced by the version we are entering in Reddit Bake-Off, which is still undergoing internal testing before public release.
5. Who are the validators?
As with any Layer 2 protocol, advancing the protocol correctly requires at least one validator (sometimes called block producers) that is honest and available. A natural question is: who are the validators?
Recall that the validator set for an Arbitrum chain is open and permissionless; anyone can start or stop validating at will. (A useful analogy is to full nodes on an L1 chain.) But we understand that even though anyone can participate, Reddit may want to guarantee that highly reputable nodes are validating their chain. Reddit may choose to validate the chain themselves and/or hire third-party validators.To this end, we have begun building a marketplace for validator-for-hire services so that dapp developers can outsource validation services to reputable nodes with high up-time. We've announced a partnership in which Chainlink nodes will provide Arbitrum validation services, and we expect to announce more partnerships shortly with other blockchain infrastructure providers.
Although there is no requirement that validators are paid, Arbitrum’s economic model tracks validators’ costs (e.g. amount of computation and storage) and can charge small fees on user transactions, using a gas-type system, to cover those costs. Alternatively, a single party such as Reddit can agree to cover the costs of invited validators.
6. Reddit Contract Support
Since Arbitrum contracts and transactions are byte-for-byte compatible with Ethereum, supporting the Reddit contracts is as simple as launching them on an Arbitrum chain.
Minting. Arbitrum Rollup supports hybrid L1/L2 tokens which can be minted in L2 and then withdrawn onto the L1. An L1 contract at address A can make a special call to the EthBridge which deploys a "buddy contract" to the same address A on an Arbitrum chain. Since it's deployed at the same address, users can know that the L2 contract is the authorized "buddy" of the L1 contract on the Arbitrum chain.
For minting, the L1 contract is a standard ERC-20 contract which mints and burns tokens when requested by the L2 contract. It is paired with an ERC-20 contract in L2 which mints tokens based on whatever programmer provided minting facility is desired and burns tokens when they are withdrawn from the rollup chain. Given this base infrastructure, Arbitrum can support any smart contract based method for minting tokens in L2, and indeed we directly support Reddit's signature/claim based minting in L2.
Batch minting. What's better than a mint cookie? A whole batch! In addition to supporting Reddit’s current minting/claiming scheme, we built a second minting design, which we believe outperforms the signature/claim system in many scenarios.
In the current system, Reddit periodically issues signed statements to users, who then take those statements to the blockchain to claim their tokens. An alternative approach would have Reddit directly submit the list of users/amounts to the blockchain and distribute the tokens to the users without the signature/claim process.
To optimize the cost efficiency of this approach, we designed an application-specific compression scheme to minimize the size of the batch distribution list. We analyzed the data from Reddit's previous distributions and found that the data is highly compressible since token amounts are small and repeated, and addresses appear multiple times. Our function groups transactions by size, and replaces previously-seen addresses with a shorter index value. We wrote client code to compress the data, wrote a Solidity decompressing function, and integrated that function into Reddit’s contract running on Arbitrum.
When we ran the compression function on the previous Reddit distribution data, we found that we could compress batched minting data down to to 11.8 bytes per minting event (averaged over a 6-month trace of Reddit’s historical token grants)compared with roughly 174 bytes of on-chain data needed for the signature claim approach to minting (roughly 43 for an RLP-encoded null transaction + 65 for Reddit's signature + 65 for the user's signature + roughly 8 for the number of Points) .
The relative benefit of the two approaches with respect to on-chain call data cost depends on the percentage of users that will actually claim their tokens on chain. With the above figures, batch minting will be cheaper if roughly 5% of users redeem their claims. We stress that our compression scheme is not Arbitrum-specific and would be beneficial in any general-purpose smart contract platform.
8. Benchmarks and costs
In this section, we give the full costs of operating the Reddit contracts on an Arbitrum Rollup chain including the L1 gas costs for the Rollup chain, the costs of computation and storage for the L2 validators as well as the capital lockup requirements for staking.
Arbitrum Rollup is still on testnet, so we did not run mainnet benchmarks. Instead, we measured the L1 gas cost and L2 workload for Reddit operations on Arbitrum and calculated the total cost assuming current Ethereum gas prices. As noted below in detail, our measurements do not assume that Arbitrum is consuming the entire capacity of Ethereum. We will present the details of our model now, but for full transparency you can also play around with it yourself and adjust the parameters, by copying the spreadsheet found here.
Our cost model is based on measurements of Reddit’s contracts, running unmodified (except for the addition of a batch minting function) on Arbitrum Rollup on top of Ethereum.
On the distribution of transactions and frequency of assertions. Reddit's instructions specify the following minimum parameters that submissions should support:
Over a 5 day period, your scaling PoC should be able to handle:
  • 100,000 point claims (minting & distributing points)
  • 25,000 subscriptions
  • 75,000 one-off points burning
  • 100,000 transfers
We provide the full costs of operating an Arbitrum Rollup chain with this usage under the assumption that tokens are minted or granted to users in batches, but other transactions are uniformly distributed over the 5 day period. Unlike some other submissions, we do not make unrealistic assumptions that all operations can be submitted in enormous batches. We assume that batch minting is done in batches that use only a few percent on an L1 block’s gas, and that other operations come in evenly over time and are submitted in batches, with one batch every five minutes to keep latency reasonable. (Users are probably already waiting for L1 finality, which takes at least that long to achieve.)
We note that assuming that there are only 300,000 transactions that arrive uniformly over the 5 day period will make our benchmark numbers lower, but we believe that this will reflect the true cost of running the system. To see why, say that batches are submitted every five minutes (20 L1 blocks) and there's a fixed overhead of c bytes of calldata per batch, the cost of which will get amortized over all transactions executed in that batch. Assume that each individual transaction adds a marginal cost of t. Lastly assume the capacity of the scaling system is high enough that it can support all of Reddit's 300,000 transactions within a single 20-block batch (i.e. that there is more than c + 300,000*t byes of calldata available in 20 blocks).
Consider what happens if c, the per-batch overhead, is large (which it is in some systems, but not in Arbitrum). In the scenario that transactions actually arrive at the system's capacity and each batch is full, then c gets amortized over 300,000 transactions. But if we assume that the system is not running at capacity--and only receives 300,000 transactions arriving uniformly over 5 days-- then each 20-block assertion will contain about 200 transactions, and thus each transaction will pay a nontrivial cost due to c.
We are aware that other proposals presented scaling numbers assuming that 300,000 transactions arrived at maximum capacity and was executed in a single mega-transaction, but according to our estimates, for at least one such report, this led to a reported gas price that was 2-3 orders of magnitude lower than it would have been assuming uniform arrival. We make more realistic batching assumptions, and we believe Arbitrum compares well when batch sizes are realistic.
Our model. Our cost model includes several sources of cost:
  • L1 gas costs: This is the cost of posting transactions as calldata on the L1 chain, as well as the overhead associated with each batch of transactions, and the L1 cost of settling transactions in the Arbitrum protocol.
  • Validator’s staking costs: In normal operation, one validator will need to be staked. The stake is assumed to be 0.2% of the total value of the chain (which is assumed to be $1 per user who is eligible to claim points). The cost of staking is the interest that could be earned on the money if it were not staked.
  • Validator computation and storage: Every validator must do computation to track the chain’s processing of transactions, and must maintain storage to keep track of the contracts’ EVM storage. The cost of computation and storage are estimated based on measurements, with the dollar cost of resources based on Amazon Web Services pricing.
It’s clear from our modeling that the predominant cost is for L1 calldata. This will probably be true for any plausible rollup-based system.
Our model also shows that Arbitrum can scale to workloads much larger than Reddit’s nominal workload, without exhausting L1 or L2 resources. The scaling bottleneck will ultimately be calldata on the L1 chain. We believe that cost could be reduced substantially if necessary by clever encoding of data. (In our design any compression / decompression of L2 transaction calldata would be done by client software and L2 programs, never by an L1 contract.)
9. Status of Arbitrum Rollup
Arbitrum Rollup is live on Ethereum testnet. All of the code written to date including everything included in the Reddit demo is open source and permissively licensed under the Apache V2 license. The first testnet version of Arbitrum Rollup was released on testnet in February. Our current internal version, which we used to benchmark the Reddit contracts, will be released soon and will be a major upgrade.
Both the Arbitrum design as well as the implementation are heavily audited by independent third parties. The Arbitrum academic paper was published at USENIX Security, a top-tier peer-reviewed academic venue. For the Arbitrum software, we have engaged Trail of Bits for a security audit, which is currently ongoing, and we are committed to have a clean report before launching on Ethereum mainnet.
10. Reddit Universe Arbitrum Rollup Chain
The benchmarks described in this document were all measured using the latest internal build of our software. When we release the new software upgrade publicly we will launch a Reddit Universe Arbitrum Rollup chain as a public demo, which will contain the Reddit contracts as well as a Uniswap instance and a Connext Hub, demonstrating how Community Points can be integrated into third party apps. We will also allow members of the public to dynamically launch ecosystem contracts. We at Offchain Labs will cover the validating costs for the Reddit Universe public demo.
If the folks at Reddit would like to evaluate our software prior to our public demo, please email us at [email protected] and we'd be more than happy to provide early access.
11. Even more scaling: Arbitrum Sidechains
Rollups are an excellent approach to scaling, and we are excited about Arbitrum Rollup which far surpasses Reddit's scaling needs. But looking forward to Reddit's eventual goal of supporting hundreds of millions of users, there will likely come a time when Reddit needs more scaling than any Rollup protocol can provide.
While Rollups greatly reduce costs, they don't break the linear barrier. That is, all transactions have an on-chain footprint (because all calldata must be posted on-chain), albeit a far smaller one than on native Ethereum, and the L1 limitations end up being the bottleneck for capacity and cost. Since Ethereum has limited capacity, this linear use of on-chain resources means that costs will eventually increase superlinearly with traffic.
The good news is that we at Offchain Labs have a solution in our roadmap that can satisfy this extreme-scaling setting as well: Arbitrum AnyTrust Sidechains. Arbitrum Sidechains are similar to Arbitrum Rollup, but deviate in that they name a permissioned set of validators. When a chain’s validators agree off-chain, they can greatly reduce the on-chain footprint of the protocol and require almost no data to be put on-chain. When validators can't reach unanimous agreement off-chain, the protocol reverts to Arbitrum Rollup. Technically, Arbitrum Sidechains can be viewed as a hybrid between state channels and Rollup, switching back and forth as necessary, and combining the performance and cost that state channels can achieve in the optimistic case, with the robustness of Rollup in other cases. The core technical challenge is how to switch seamlessly between modes and how to guarantee that security is maintained throughout.
Arbitrum Sidechains break through this linear barrier, while still maintaining a high level of security and decentralization. Arbitrum Sidechains provide the AnyTrust guarantee, which says that as long as any one validator is honest and available (even if you don't know which one will be), the L2 chain is guaranteed to execute correctly according to its code and guaranteed to make progress. Unlike in a state channel, offchain progress does not require unanimous consent, and liveness is preserved as long as there is a single honest validator.
Note that the trust model for Arbitrum Sidechains is much stronger than for typical BFT-style chains which introduce a consensus "voting" protocols among a small permissioned group of validators. BFT-based protocols require a supermajority (more than 2/3) of validators to agree. In Arbitrum Sidechains, by contrast, all you need is a single honest validator to achieve guaranteed correctness and progress. Notice that in Arbitrum adding validators strictly increases security since the AnyTrust guarantee provides correctness as long as any one validator is honest and available. By contrast, in BFT-style protocols, adding nodes can be dangerous as a coalition of dishonest nodes can break the protocol.
Like Arbitrum Rollup, the developer and user experiences for Arbitrum Sidechains will be identical to that of Ethereum. Reddit would be able to choose a large and diverse set of validators, and all that they would need to guarantee to break through the scaling barrier is that a single one of them will remain honest.
We hope to have Arbitrum Sidechains in production in early 2021, and thus when Reddit reaches the scale that surpasses the capacity of Rollups, Arbitrum Sidechains will be waiting and ready to help.
While the idea to switch between channels and Rollup to get the best of both worlds is conceptually simple, getting the details right and making sure that the switch does not introduce any attack vectors is highly non-trivial and has been the subject of years of our research (indeed, we were working on this design for years before the term Rollup was even coined).
12. How Arbitrum compares
We include a comparison to several other categories as well as specific projects when appropriate. and explain why we believe that Arbitrum is best suited for Reddit's purposes. We focus our attention on other Ethereum projects.
Payment only Rollups. Compared to Arbitrum Rollup, ZK-Rollups and other Rollups that only support token transfers have several disadvantages:
  • As outlined throughout the proposal, we believe that the entire draw of Ethereum is in its rich smart contracts support which is simply not achievable with today's zero-knowledge proof technology. Indeed, scaling with a ZK-Rollup will add friction to the deployment of smart contracts that interact with Community Points as users will have to withdraw their coins from the ZK-Rollup and transfer them to a smart contract system (like Arbitrum). The community will be best served if Reddit builds on a platform that has built-in, frictionless smart-contract support.
  • All other Rollup protocols of which we are aware employ a centralized operator. While it's true that users retain custody of their coins, the centralized operator can often profit from censoring, reordering, or delaying transactions. A common misconception is that since they're non-custodial protocols, a centralized sequencer does not pose a risk but this is incorrect as the sequencer can wreak havoc or shake down users for side payments without directly stealing funds.
  • Sidechain type protocols can eliminate some of these issues, but they are not trustless. Instead, they require trust in some quorum of a committee, often requiring two-third of the committee to be honest, compared to rollup protocols like Arbitrum that require only a single honest party. In addition, not all sidechain type protocols have committees that are diverse, or even non-centralized, in practice.
  • Plasma-style protocols have a centralized operator and do not support general smart contracts.
13. Concluding Remarks
While it's ultimately up to the judges’ palate, we believe that Arbitrum Rollup is the bakeoff choice that Reddit kneads. We far surpass Reddit's specified workload requirement at present, have much room to optimize Arbitrum Rollup in the near term, and have a clear path to get Reddit to hundreds of millions of users. Furthermore, we are the only project that gives developers and users the identical interface as the Ethereum blockchain and is fully interoperable and tooling-compatible, and we do this all without any new trust assumptions or centralized components.
But no matter how the cookie crumbles, we're glad to have participated in this bake-off and we thank you for your consideration.
About Offchain Labs
Offchain Labs, Inc. is a venture-funded New York company that spun out of Princeton University research, and is building the Arbitrum platform to usher in the next generation of scalable, interoperable, and compatible smart contracts. Offchain Labs is backed by Pantera Capital, Compound VC, Coinbase Ventures, and others.
Leadership Team
Ed Felten
Ed Felten is Co-founder and Chief Scientist at Offchain Labs. He is on leave from Princeton University, where he is the Robert E. Kahn Professor of Computer Science and Public Affairs. From 2015 to 2017 he served at the White House as Deputy United States Chief Technology Officer and senior advisor to the President. He is an ACM Fellow and member of the National Academy of Engineering. Outside of work, he is an avid runner, cook, and L.A. Dodgers fan.
Steven Goldfeder
Steven Goldfeder is Co-founder and Chief Executive Officer at Offchain Labs. He holds a PhD from Princeton University, where he worked at the intersection of cryptography and cryptocurrencies including threshold cryptography, zero-knowledge proof systems, and post-quantum signatures. He is a co-author of Bitcoin and Cryptocurrency Technologies, the leading textbook on cryptocurrencies, and he has previously worked at Google and Microsoft Research, where he co-invented the Picnic signature algorithm. When not working, you can find Steven spending time with his family, taking a nature walk, or twisting balloons.
Harry Kalodner
Harry Kalodner is Co-founder and Chief Technology Officer at Offchain Labs where he leads the engineering team. Before the company he attended Princeton as a Ph.D candidate where his research explored economics, anonymity, and incentive compatibility of cryptocurrencies, and he also has worked at Apple. When not up at 3:00am writing code, Harry occasionally sleeps.
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Why i’m bullish on Zilliqa (long read)

Edit: TL;DR added in the comments
 
Hey all, I've been researching coins since 2017 and have gone through 100s of them in the last 3 years. I got introduced to blockchain via Bitcoin of course, analyzed Ethereum thereafter and from that moment I have a keen interest in smart contact platforms. I’m passionate about Ethereum but I find Zilliqa to have a better risk-reward ratio. Especially because Zilliqa has found an elegant balance between being secure, decentralized and scalable in my opinion.
 
Below I post my analysis of why from all the coins I went through I’m most bullish on Zilliqa (yes I went through Tezos, EOS, NEO, VeChain, Harmony, Algorand, Cardano etc.). Note that this is not investment advice and although it's a thorough analysis there is obviously some bias involved. Looking forward to what you all think!
 
Fun fact: the name Zilliqa is a play on ‘silica’ silicon dioxide which means “Silicon for the high-throughput consensus computer.”
 
This post is divided into (i) Technology, (ii) Business & Partnerships, and (iii) Marketing & Community. I’ve tried to make the technology part readable for a broad audience. If you’ve ever tried understanding the inner workings of Bitcoin and Ethereum you should be able to grasp most parts. Otherwise, just skim through and once you are zoning out head to the next part.
 
Technology and some more:
 
Introduction
 
The technology is one of the main reasons why I’m so bullish on Zilliqa. First thing you see on their website is: “Zilliqa is a high-performance, high-security blockchain platform for enterprises and next-generation applications.” These are some bold statements.
 
Before we deep dive into the technology let’s take a step back in time first as they have quite the history. The initial research paper from which Zilliqa originated dates back to August 2016: Elastico: A Secure Sharding Protocol For Open Blockchains where Loi Luu (Kyber Network) is one of the co-authors. Other ideas that led to the development of what Zilliqa has become today are: Bitcoin-NG, collective signing CoSi, ByzCoin and Omniledger.
 
The technical white paper was made public in August 2017 and since then they have achieved everything stated in the white paper and also created their own open source intermediate level smart contract language called Scilla (functional programming language similar to OCaml) too.
 
Mainnet is live since the end of January 2019 with daily transaction rates growing continuously. About a week ago mainnet reached 5 million transactions, 500.000+ addresses in total along with 2400 nodes keeping the network decentralized and secure. Circulating supply is nearing 11 billion and currently only mining rewards are left. The maximum supply is 21 billion with annual inflation being 7.13% currently and will only decrease with time.
 
Zilliqa realized early on that the usage of public cryptocurrencies and smart contracts were increasing but decentralized, secure, and scalable alternatives were lacking in the crypto space. They proposed to apply sharding onto a public smart contract blockchain where the transaction rate increases almost linear with the increase in the amount of nodes. More nodes = higher transaction throughput and increased decentralization. Sharding comes in many forms and Zilliqa uses network-, transaction- and computational sharding. Network sharding opens up the possibility of using transaction- and computational sharding on top. Zilliqa does not use state sharding for now. We’ll come back to this later.
 
Before we continue dissecting how Zilliqa achieves such from a technological standpoint it’s good to keep in mind that a blockchain being decentralised and secure and scalable is still one of the main hurdles in allowing widespread usage of decentralised networks. In my opinion this needs to be solved first before blockchains can get to the point where they can create and add large scale value. So I invite you to read the next section to grasp the underlying fundamentals. Because after all these premises need to be true otherwise there isn’t a fundamental case to be bullish on Zilliqa, right?
 
Down the rabbit hole
 
How have they achieved this? Let’s define the basics first: key players on Zilliqa are the users and the miners. A user is anybody who uses the blockchain to transfer funds or run smart contracts. Miners are the (shard) nodes in the network who run the consensus protocol and get rewarded for their service in Zillings (ZIL). The mining network is divided into several smaller networks called shards, which is also referred to as ‘network sharding’. Miners subsequently are randomly assigned to a shard by another set of miners called DS (Directory Service) nodes. The regular shards process transactions and the outputs of these shards are eventually combined by the DS shard as they reach consensus on the final state. More on how these DS shards reach consensus (via pBFT) will be explained later on.
 
The Zilliqa network produces two types of blocks: DS blocks and Tx blocks. One DS Block consists of 100 Tx Blocks. And as previously mentioned there are two types of nodes concerned with reaching consensus: shard nodes and DS nodes. Becoming a shard node or DS node is being defined by the result of a PoW cycle (Ethash) at the beginning of the DS Block. All candidate mining nodes compete with each other and run the PoW (Proof-of-Work) cycle for 60 seconds and the submissions achieving the highest difficulty will be allowed on the network. And to put it in perspective: the average difficulty for one DS node is ~ 2 Th/s equaling 2.000.000 Mh/s or 55 thousand+ GeForce GTX 1070 / 8 GB GPUs at 35.4 Mh/s. Each DS Block 10 new DS nodes are allowed. And a shard node needs to provide around 8.53 GH/s currently (around 240 GTX 1070s). Dual mining ETH/ETC and ZIL is possible and can be done via mining software such as Phoenix and Claymore. There are pools and if you have large amounts of hashing power (Ethash) available you could mine solo.
 
The PoW cycle of 60 seconds is a peak performance and acts as an entry ticket to the network. The entry ticket is called a sybil resistance mechanism and makes it incredibly hard for adversaries to spawn lots of identities and manipulate the network with these identities. And after every 100 Tx Blocks which corresponds to roughly 1,5 hour this PoW process repeats. In between these 1,5 hour, no PoW needs to be done meaning Zilliqa’s energy consumption to keep the network secure is low. For more detailed information on how mining works click here.
Okay, hats off to you. You have made it this far. Before we go any deeper down the rabbit hole we first must understand why Zilliqa goes through all of the above technicalities and understand a bit more what a blockchain on a more fundamental level is. Because the core of Zilliqa’s consensus protocol relies on the usage of pBFT (practical Byzantine Fault Tolerance) we need to know more about state machines and their function. Navigate to Viewblock, a Zilliqa block explorer, and just come back to this article. We will use this site to navigate through a few concepts.
 
We have established that Zilliqa is a public and distributed blockchain. Meaning that everyone with an internet connection can send ZILs, trigger smart contracts, etc. and there is no central authority who fully controls the network. Zilliqa and other public and distributed blockchains (like Bitcoin and Ethereum) can also be defined as state machines.
 
Taking the liberty of paraphrasing examples and definitions given by Samuel Brooks’ medium article, he describes the definition of a blockchain (like Zilliqa) as: “A peer-to-peer, append-only datastore that uses consensus to synchronize cryptographically-secure data”.
 
Next, he states that: "blockchains are fundamentally systems for managing valid state transitions”. For some more context, I recommend reading the whole medium article to get a better grasp of the definitions and understanding of state machines. Nevertheless, let’s try to simplify and compile it into a single paragraph. Take traffic lights as an example: all its states (red, amber, and green) are predefined, all possible outcomes are known and it doesn’t matter if you encounter the traffic light today or tomorrow. It will still behave the same. Managing the states of a traffic light can be done by triggering a sensor on the road or pushing a button resulting in one traffic lights’ state going from green to red (via amber) and another light from red to green.
 
With public blockchains like Zilliqa, this isn’t so straightforward and simple. It started with block #1 almost 1,5 years ago and every 45 seconds or so a new block linked to the previous block is being added. Resulting in a chain of blocks with transactions in it that everyone can verify from block #1 to the current #647.000+ block. The state is ever changing and the states it can find itself in are infinite. And while the traffic light might work together in tandem with various other traffic lights, it’s rather insignificant comparing it to a public blockchain. Because Zilliqa consists of 2400 nodes who need to work together to achieve consensus on what the latest valid state is while some of these nodes may have latency or broadcast issues, drop offline or are deliberately trying to attack the network, etc.
 
Now go back to the Viewblock page take a look at the amount of transaction, addresses, block and DS height and then hit refresh. Obviously as expected you see new incremented values on one or all parameters. And how did the Zilliqa blockchain manage to transition from a previous valid state to the latest valid state? By using pBFT to reach consensus on the latest valid state.
 
After having obtained the entry ticket, miners execute pBFT to reach consensus on the ever-changing state of the blockchain. pBFT requires a series of network communication between nodes, and as such there is no GPU involved (but CPU). Resulting in the total energy consumed to keep the blockchain secure, decentralized and scalable being low.
 
pBFT stands for practical Byzantine Fault Tolerance and is an optimization on the Byzantine Fault Tolerant algorithm. To quote Blockonomi: “In the context of distributed systems, Byzantine Fault Tolerance is the ability of a distributed computer network to function as desired and correctly reach a sufficient consensus despite malicious components (nodes) of the system failing or propagating incorrect information to other peers.” Zilliqa is such a distributed computer network and depends on the honesty of the nodes (shard and DS) to reach consensus and to continuously update the state with the latest block. If pBFT is a new term for you I can highly recommend the Blockonomi article.
 
The idea of pBFT was introduced in 1999 - one of the authors even won a Turing award for it - and it is well researched and applied in various blockchains and distributed systems nowadays. If you want more advanced information than the Blockonomi link provides click here. And if you’re in between Blockonomi and the University of Singapore read the Zilliqa Design Story Part 2 dating from October 2017.
Quoting from the Zilliqa tech whitepaper: “pBFT relies upon a correct leader (which is randomly selected) to begin each phase and proceed when the sufficient majority exists. In case the leader is byzantine it can stall the entire consensus protocol. To address this challenge, pBFT offers a view change protocol to replace the byzantine leader with another one.”
 
pBFT can tolerate ⅓ of the nodes being dishonest (offline counts as Byzantine = dishonest) and the consensus protocol will function without stalling or hiccups. Once there are more than ⅓ of dishonest nodes but no more than ⅔ the network will be stalled and a view change will be triggered to elect a new DS leader. Only when more than ⅔ of the nodes are dishonest (66%) double-spend attacks become possible.
 
If the network stalls no transactions can be processed and one has to wait until a new honest leader has been elected. When the mainnet was just launched and in its early phases, view changes happened regularly. As of today the last stalling of the network - and view change being triggered - was at the end of October 2019.
 
Another benefit of using pBFT for consensus besides low energy is the immediate finality it provides. Once your transaction is included in a block and the block is added to the chain it’s done. Lastly, take a look at this article where three types of finality are being defined: probabilistic, absolute and economic finality. Zilliqa falls under the absolute finality (just like Tendermint for example). Although lengthy already we skipped through some of the inner workings from Zilliqa’s consensus: read the Zilliqa Design Story Part 3 and you will be close to having a complete picture on it. Enough about PoW, sybil resistance mechanism, pBFT, etc. Another thing we haven’t looked at yet is the amount of decentralization.
 
Decentralisation
 
Currently, there are four shards, each one of them consisting of 600 nodes. 1 shard with 600 so-called DS nodes (Directory Service - they need to achieve a higher difficulty than shard nodes) and 1800 shard nodes of which 250 are shard guards (centralized nodes controlled by the team). The amount of shard guards has been steadily declining from 1200 in January 2019 to 250 as of May 2020. On the Viewblock statistics, you can see that many of the nodes are being located in the US but those are only the (CPU parts of the) shard nodes who perform pBFT. There is no data from where the PoW sources are coming. And when the Zilliqa blockchain starts reaching its transaction capacity limit, a network upgrade needs to be executed to lift the current cap of maximum 2400 nodes to allow more nodes and formation of more shards which will allow to network to keep on scaling according to demand.
Besides shard nodes there are also seed nodes. The main role of seed nodes is to serve as direct access points (for end-users and clients) to the core Zilliqa network that validates transactions. Seed nodes consolidate transaction requests and forward these to the lookup nodes (another type of nodes) for distribution to the shards in the network. Seed nodes also maintain the entire transaction history and the global state of the blockchain which is needed to provide services such as block explorers. Seed nodes in the Zilliqa network are comparable to Infura on Ethereum.
 
The seed nodes were first only operated by Zilliqa themselves, exchanges and Viewblock. Operators of seed nodes like exchanges had no incentive to open them for the greater public. They were centralised at first. Decentralisation at the seed nodes level has been steadily rolled out since March 2020 ( Zilliqa Improvement Proposal 3 ). Currently the amount of seed nodes is being increased, they are public-facing and at the same time PoS is applied to incentivize seed node operators and make it possible for ZIL holders to stake and earn passive yields. Important distinction: seed nodes are not involved with consensus! That is still PoW as entry ticket and pBFT for the actual consensus.
 
5% of the block rewards are being assigned to seed nodes (from the beginning in 2019) and those are being used to pay out ZIL stakers. The 5% block rewards with an annual yield of 10.03% translate to roughly 610 MM ZILs in total that can be staked. Exchanges use the custodial variant of staking and wallets like Moonlet will use the non-custodial version (starting in Q3 2020). Staking is being done by sending ZILs to a smart contract created by Zilliqa and audited by Quantstamp.
 
With a high amount of DS; shard nodes and seed nodes becoming more decentralized too, Zilliqa qualifies for the label of decentralized in my opinion.
 
Smart contracts
 
Let me start by saying I’m not a developer and my programming skills are quite limited. So I‘m taking the ELI5 route (maybe 12) but if you are familiar with Javascript, Solidity or specifically OCaml please head straight to Scilla - read the docs to get a good initial grasp of how Zilliqa’s smart contract language Scilla works and if you ask yourself “why another programming language?” check this article. And if you want to play around with some sample contracts in an IDE click here. The faucet can be found here. And more information on architecture, dapp development and API can be found on the Developer Portal.
If you are more into listening and watching: check this recent webinar explaining Zilliqa and Scilla. Link is time-stamped so you’ll start right away with a platform introduction, roadmap 2020 and afterwards a proper Scilla introduction.
 
Generalized: programming languages can be divided into being ‘object-oriented’ or ‘functional’. Here is an ELI5 given by software development academy: * “all programs have two basic components, data – what the program knows – and behavior – what the program can do with that data. So object-oriented programming states that combining data and related behaviors in one place, is called “object”, which makes it easier to understand how a particular program works. On the other hand, functional programming argues that data and behavior are different things and should be separated to ensure their clarity.” *
 
Scilla is on the functional side and shares similarities with OCaml: OCaml is a general-purpose programming language with an emphasis on expressiveness and safety. It has an advanced type system that helps catch your mistakes without getting in your way. It's used in environments where a single mistake can cost millions and speed matters, is supported by an active community, and has a rich set of libraries and development tools. For all its power, OCaml is also pretty simple, which is one reason it's often used as a teaching language.
 
Scilla is blockchain agnostic, can be implemented onto other blockchains as well, is recognized by academics and won a so-called Distinguished Artifact Award award at the end of last year.
 
One of the reasons why the Zilliqa team decided to create their own programming language focused on preventing smart contract vulnerabilities is that adding logic on a blockchain, programming, means that you cannot afford to make mistakes. Otherwise, it could cost you. It’s all great and fun blockchains being immutable but updating your code because you found a bug isn’t the same as with a regular web application for example. And with smart contracts, it inherently involves cryptocurrencies in some form thus value.
 
Another difference with programming languages on a blockchain is gas. Every transaction you do on a smart contract platform like Zilliqa or Ethereum costs gas. With gas you basically pay for computational costs. Sending a ZIL from address A to address B costs 0.001 ZIL currently. Smart contracts are more complex, often involve various functions and require more gas (if gas is a new concept click here ).
 
So with Scilla, similar to Solidity, you need to make sure that “every function in your smart contract will run as expected without hitting gas limits. An improper resource analysis may lead to situations where funds may get stuck simply because a part of the smart contract code cannot be executed due to gas limits. Such constraints are not present in traditional software systems”. Scilla design story part 1
 
Some examples of smart contract issues you’d want to avoid are: leaking funds, ‘unexpected changes to critical state variables’ (example: someone other than you setting his or her address as the owner of the smart contract after creation) or simply killing a contract.
 
Scilla also allows for formal verification. Wikipedia to the rescue: In the context of hardware and software systems, formal verification is the act of proving or disproving the correctness of intended algorithms underlying a system with respect to a certain formal specification or property, using formal methods of mathematics.
 
Formal verification can be helpful in proving the correctness of systems such as: cryptographic protocols, combinational circuits, digital circuits with internal memory, and software expressed as source code.
 
Scilla is being developed hand-in-hand with formalization of its semantics and its embedding into the Coq proof assistant — a state-of-the art tool for mechanized proofs about properties of programs.”
 
Simply put, with Scilla and accompanying tooling developers can be mathematically sure and proof that the smart contract they’ve written does what he or she intends it to do.
 
Smart contract on a sharded environment and state sharding
 
There is one more topic I’d like to touch on: smart contract execution in a sharded environment (and what is the effect of state sharding). This is a complex topic. I’m not able to explain it any easier than what is posted here. But I will try to compress the post into something easy to digest.
 
Earlier on we have established that Zilliqa can process transactions in parallel due to network sharding. This is where the linear scalability comes from. We can define simple transactions: a transaction from address A to B (Category 1), a transaction where a user interacts with one smart contract (Category 2) and the most complex ones where triggering a transaction results in multiple smart contracts being involved (Category 3). The shards are able to process transactions on their own without interference of the other shards. With Category 1 transactions that is doable, with Category 2 transactions sometimes if that address is in the same shard as the smart contract but with Category 3 you definitely need communication between the shards. Solving that requires to make a set of communication rules the protocol needs to follow in order to process all transactions in a generalised fashion.
 
And this is where the downsides of state sharding comes in currently. All shards in Zilliqa have access to the complete state. Yes the state size (0.1 GB at the moment) grows and all of the nodes need to store it but it also means that they don’t need to shop around for information available on other shards. Requiring more communication and adding more complexity. Computer science knowledge and/or developer knowledge required links if you want to dig further: Scilla - language grammar Scilla - Foundations for Verifiable Decentralised Computations on a Blockchain Gas Accounting NUS x Zilliqa: Smart contract language workshop
 
Easier to follow links on programming Scilla https://learnscilla.com/home Ivan on Tech
 
Roadmap / Zilliqa 2.0
 
There is no strict defined roadmap but here are topics being worked on. And via the Zilliqa website there is also more information on the projects they are working on.
 
Business & Partnerships
 
It’s not only technology in which Zilliqa seems to be excelling as their ecosystem has been expanding and starting to grow rapidly. The project is on a mission to provide OpenFinance (OpFi) to the world and Singapore is the right place to be due to its progressive regulations and futuristic thinking. Singapore has taken a proactive approach towards cryptocurrencies by introducing the Payment Services Act 2019 (PS Act). Among other things, the PS Act will regulate intermediaries dealing with certain cryptocurrencies, with a particular focus on consumer protection and anti-money laundering. It will also provide a stable regulatory licensing and operating framework for cryptocurrency entities, effectively covering all crypto businesses and exchanges based in Singapore. According to PWC 82% of the surveyed executives in Singapore reported blockchain initiatives underway and 13% of them have already brought the initiatives live to the market. There is also an increasing list of organizations that are starting to provide digital payment services. Moreover, Singaporean blockchain developers Building Cities Beyond has recently created an innovation $15 million grant to encourage development on its ecosystem. This all suggests that Singapore tries to position itself as (one of) the leading blockchain hubs in the world.
 
Zilliqa seems to already take advantage of this and recently helped launch Hg Exchange on their platform, together with financial institutions PhillipCapital, PrimePartners and Fundnel. Hg Exchange, which is now approved by the Monetary Authority of Singapore (MAS), uses smart contracts to represent digital assets. Through Hg Exchange financial institutions worldwide can use Zilliqa's safe-by-design smart contracts to enable the trading of private equities. For example, think of companies such as Grab, Airbnb, SpaceX that are not available for public trading right now. Hg Exchange will allow investors to buy shares of private companies & unicorns and capture their value before an IPO. Anquan, the main company behind Zilliqa, has also recently announced that they became a partner and shareholder in TEN31 Bank, which is a fully regulated bank allowing for tokenization of assets and is aiming to bridge the gap between conventional banking and the blockchain world. If STOs, the tokenization of assets, and equity trading will continue to increase, then Zilliqa’s public blockchain would be the ideal candidate due to its strategic positioning, partnerships, regulatory compliance and the technology that is being built on top of it.
 
What is also very encouraging is their focus on banking the un(der)banked. They are launching a stablecoin basket starting with XSGD. As many of you know, stablecoins are currently mostly used for trading. However, Zilliqa is actively trying to broaden the use case of stablecoins. I recommend everybody to read this text that Amrit Kumar wrote (one of the co-founders). These stablecoins will be integrated in the traditional markets and bridge the gap between the crypto world and the traditional world. This could potentially revolutionize and legitimise the crypto space if retailers and companies will for example start to use stablecoins for payments or remittances, instead of it solely being used for trading.
 
Zilliqa also released their DeFi strategic roadmap (dating November 2019) which seems to be aligning well with their OpFi strategy. A non-custodial DEX is coming to Zilliqa made by Switcheo which allows cross-chain trading (atomic swaps) between ETH, EOS and ZIL based tokens. They also signed a Memorandum of Understanding for a (soon to be announced) USD stablecoin. And as Zilliqa is all about regulations and being compliant, I’m speculating on it to be a regulated USD stablecoin. Furthermore, XSGD is already created and visible on block explorer and XIDR (Indonesian Stablecoin) is also coming soon via StraitsX. Here also an overview of the Tech Stack for Financial Applications from September 2019. Further quoting Amrit Kumar on this:
 
There are two basic building blocks in DeFi/OpFi though: 1) stablecoins as you need a non-volatile currency to get access to this market and 2) a dex to be able to trade all these financial assets. The rest are built on top of these blocks.
 
So far, together with our partners and community, we have worked on developing these building blocks with XSGD as a stablecoin. We are working on bringing a USD-backed stablecoin as well. We will soon have a decentralised exchange developed by Switcheo. And with HGX going live, we are also venturing into the tokenization space. More to come in the future.”
 
Additionally, they also have this ZILHive initiative that injects capital into projects. There have been already 6 waves of various teams working on infrastructure, innovation and research, and they are not from ASEAN or Singapore only but global: see Grantees breakdown by country. Over 60 project teams from over 20 countries have contributed to Zilliqa's ecosystem. This includes individuals and teams developing wallets, explorers, developer toolkits, smart contract testing frameworks, dapps, etc. As some of you may know, Unstoppable Domains (UD) blew up when they launched on Zilliqa. UD aims to replace cryptocurrency addresses with a human-readable name and allows for uncensorable websites. Zilliqa will probably be the only one able to handle all these transactions onchain due to ability to scale and its resulting low fees which is why the UD team launched this on Zilliqa in the first place. Furthermore, Zilliqa also has a strong emphasis on security, compliance, and privacy, which is why they partnered with companies like Elliptic, ChainSecurity (part of PwC Switzerland), and Incognito. Their sister company Aqilliz (Zilliqa spelled backwards) focuses on revolutionizing the digital advertising space and is doing interesting things like using Zilliqa to track outdoor digital ads with companies like Foodpanda.
 
Zilliqa is listed on nearly all major exchanges, having several different fiat-gateways and recently have been added to Binance’s margin trading and futures trading with really good volume. They also have a very impressive team with good credentials and experience. They don't just have “tech people”. They have a mix of tech people, business people, marketeers, scientists, and more. Naturally, it's good to have a mix of people with different skill sets if you work in the crypto space.
 
Marketing & Community
 
Zilliqa has a very strong community. If you just follow their Twitter their engagement is much higher for a coin that has approximately 80k followers. They also have been ‘coin of the day’ by LunarCrush many times. LunarCrush tracks real-time cryptocurrency value and social data. According to their data, it seems Zilliqa has a more fundamental and deeper understanding of marketing and community engagement than almost all other coins. While almost all coins have been a bit frozen in the last months, Zilliqa seems to be on its own bull run. It was somewhere in the 100s a few months ago and is currently ranked #46 on CoinGecko. Their official Telegram also has over 20k people and is very active, and their community channel which is over 7k now is more active and larger than many other official channels. Their local communities also seem to be growing.
 
Moreover, their community started ‘Zillacracy’ together with the Zilliqa core team ( see www.zillacracy.com ). It’s a community-run initiative where people from all over the world are now helping with marketing and development on Zilliqa. Since its launch in February 2020 they have been doing a lot and will also run their own non-custodial seed node for staking. This seed node will also allow them to start generating revenue for them to become a self sustaining entity that could potentially scale up to become a decentralized company working in parallel with the Zilliqa core team. Comparing it to all the other smart contract platforms (e.g. Cardano, EOS, Tezos etc.) they don't seem to have started a similar initiative (correct me if I’m wrong though). This suggests in my opinion that these other smart contract platforms do not fully understand how to utilize the ‘power of the community’. This is something you cannot ‘buy with money’ and gives many projects in the space a disadvantage.
 
Zilliqa also released two social products called SocialPay and Zeeves. SocialPay allows users to earn ZILs while tweeting with a specific hashtag. They have recently used it in partnership with the Singapore Red Cross for a marketing campaign after their initial pilot program. It seems like a very valuable social product with a good use case. I can see a lot of traditional companies entering the space through this product, which they seem to suggest will happen. Tokenizing hashtags with smart contracts to get network effect is a very smart and innovative idea.
 
Regarding Zeeves, this is a tipping bot for Telegram. They already have 1000s of signups and they plan to keep upgrading it for more and more people to use it (e.g. they recently have added a quiz features). They also use it during AMAs to reward people in real-time. It’s a very smart approach to grow their communities and get familiar with ZIL. I can see this becoming very big on Telegram. This tool suggests, again, that the Zilliqa team has a deeper understanding of what the crypto space and community needs and is good at finding the right innovative tools to grow and scale.
 
To be honest, I haven’t covered everything (i’m also reaching the character limited haha). So many updates happening lately that it's hard to keep up, such as the International Monetary Fund mentioning Zilliqa in their report, custodial and non-custodial Staking, Binance Margin, Futures, Widget, entering the Indian market, and more. The Head of Marketing Colin Miles has also released this as an overview of what is coming next. And last but not least, Vitalik Buterin has been mentioning Zilliqa lately acknowledging Zilliqa and mentioning that both projects have a lot of room to grow. There is much more info of course and a good part of it has been served to you on a silver platter. I invite you to continue researching by yourself :-) And if you have any comments or questions please post here!
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HAVE YOU CHECKED OUT TELOS (TLOS)?

Have you checked out Telos (TLOS)? Telos is an INDEPENDENT sister-chain of EOS and uses the same EOSIO technology. If EOS’s mainnet were to fail, it would have no effect on Telos’s performance.
I know what some of you are thinking. EOS raised 4 billion dollars from their ICO and since their mainnet launch, both their mainnet and token price have been struggling with users unable to complete the simplest transactions without having to go through additional steps which require help from their tech community. Telos was created without ICO funding which is rare, by approximately 130 members of the EOS and tech community after they identified the flaws EOS encountered with its Governance model. TELOS OPERATES THE WAY EOS WAS INTENDED TO OPERATE. Telos’s governance model is second to none. It does NOT allow for exchange voting or BP representation, collusion or vote buying.
I like Telos’s attention to details. Unlike EOS, the BP rewards are equitable with the top 21 BPs receiving the same amount of rewards for producing blocks. This applies to the standby BPs as well.
Here is an article which compares Telos’s governance to Tezos’s.
https://telosnetwork.io/2020/01/30/blockchain-governance-telos-v-tezos/
Here’s a second article explaining how Governance has advanced since Bitcoin’s inception.
https://www.publish0x.com/crypto-investing/the-evolution-of-blockchain-governance-featuring-telos-xdzowr?a=LDdwxl8e1Y
Blockone also took 10% of EOS’s pre-mine supply on top of the 4 billion they raised. WOW! Telos, by comparison, took only 5% of their pre-mine supply to reimburse the developers for creating Telos. This is extremely reasonable in comparison to EOS and other tokens.
Telos has more dapps on their platform then Tezos or Cardano. If you like Cardano or Tezos, you should love Telos. It’s second on Blocktivity and has been consistently with ½ second transaction times.
Telos has provided a second layer solution for Ethereum and Bitcoin which is quicker than Lightening Network with NO fees. Telos EVM emulates the Ethereum Virtual Machine and allows Solidity based projects to run approximately 300 times faster with NO fees or congestion. Here is more information,
https://www.telos.net/telos-evm
For more general information, you can also check out this recent video by Girl Gone Crypto where she interviews Douglas Horn who was one of the founders and White Paper author.
https://www.youtube.com/watch?v=NipQlOtwUz4
One of the steps that investors use, when analyzing a particular stock’s merits, is to look at its issued and total share supply. Cryptos are no different. It Is important to look at the circulating and total supply as well as the difference between these two. The difference between the circulating and total supply is what is available to circulate in the future. I personally do not like to see a large difference. For example, Chainlink is holding onto 61% of its supply. Cardano is holding onto 30% of its supply. Telos is holding onto 21% of its supply which is more favorable than Chainlink or Cardano.
The total market cap of a crypto is based on the price per token multiplied by its circulating supply. If Chainlink added the other 61% it holds into its’ circulating supply, it could dilute the token price by 61% based on its’ total market cap. Chainlink would never do this but, having such an access can lead to supply and demand problems as well as other issues.
Telos is a project worth looking at, and investing in with nothing but potential. The token price is ridiculously cheap at the moment.
Call to action:
Now is the perfect time to participate in the Telos community.
Want to learn more,
Other informative links Which also appear on the right hand side.
https://twitter.com/TelosNetwork
https://www.t.me/HelloTelos
https://medium.com/@teloslogical
https://www.youtube.com/results?search_query=Telos+Cryptocurrency
https://resources.telosfoundation.io/wp_mastetelos_white_paper_english.pdf
https://www.telos.net/
https://www.telosfoundation.io/
Want to set up a free account,
https://www.reddit.com/TELOS/comments/ilkdbn/new_account_considerations_and_step_by_step_set_up/
Want to buy Telos,
USDT Trading Pair - https://www.probit.com/en-us/
BTC Trading Pair - https://p2pb2b.io/trade/TLOS_BTC
EOS Trading Pair - https://newdex.io/trade/eosio.token-tlos-eos This is a decentralized exchange accessed using your EOS wallet through Scatter, Wombat or Anchor.
submitted by OldBobDontKnow to TELOS [link] [comments]

[SHARE] Fulfilled Request Megathread 4 FREE DOWNLOAD

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[BOOK] 'The macabresque : human violation and hate in genocide, mass atrocity and enemy-making' Edward Weisband, Oxford University Press 2018(self) 1 [BOOK] Scotland After the Ice Age Environment, Archaeology and History 8000 BC - AD 1000(self) 1 [Book] Ethics of Captivity edited by Lori Gruen(self) 1 [Book] Aspects of American History By Simon Henderson(self) 1 [Book] The Soviet Colossus History and Aftermath By Michael G. Kort(self) 1 [BOOK] Challenges to Political Decision-making Dealing with Information Overload, Ignorance and Contested Knowledge(self) 5 [Article] The EU Competition Law Fining System: A Reassessment, Damien Geradin(self) 1 [Book] Russia and the USSR, 1855–1991 Autocracy and Dictatorship ByStephen J. Lee(self) 1 [Book] Søren Kierkegaard: Epistemology and psychology : Kierkegaard and the recoil from freedom - Daniel W. Conway, K. E. Gover(self) 4 [ARTICLE] 'A History of Reason in the Age of Insanity: The Deconstruction of Foucault in Hegel’s Phenomenology' The Owl of Minerva, Volume 25, Issue 1, Fall 1993, Andrew Cutrofello Pages 15-21(self) 1 [BOOK] Mere Civility by Teresa M. Bejan(self) 2 [book] The Philosophy Shop by Peter Worley(self) 1 [BOOK] Sentenciando Trafico - Marcelo Semer(self) 1 [Article] GENETIC INSTABILITY ASSOCIATED WITH BREAK-INDUCED REPLICATION(self) 1 [Article] Properties of elastic bodies in contact - J. Dundurs 1975(self) 2 [Article] Transition alumina phases induced by heat treatment of boehmite: An X-ray diffraction and infrared spectroscopy study(self) 1 [Book] Russian Companion by James Cooper(self) 1 [Book] Model Stock Purchase Agreement with Commentary, by American Bar Association(self) 1 [Book] A History of Modern France By Jeremy D. Popkin(self) 1 [Book] Mathematical Notation: A Guide for Engineers and Scientists(self) 1 [Book] The Epistemological Significance of the Interrogative by James Somerville(self) 1 [Book] Looking for Managing Human Resources 11e. by Cascio, Wayne F.(self) 4 [Article] XVIII. The arrangement of atoms in crystals(self) 4 [Article] I am looking for "The Myth of Cartesian Privacy"(self) 5 [Book] Litigating morality : American legal thought and its English roots(self) 4 [Article] Child-on-child sexual abuse: An investigation of behavioral and emotional sequelae(self) 1 [Book] La proyección del neoliberalismo: Las transformaciones del cine mexicano (1988–2012)(self) 1 [Book] Handbook of Research on Online Discussion-Based Teaching Methods - Lesley Wilton and Clare Brett(self) 2 [Article] Turning up the Lights on Gaslighting by Kate Abramson in Philosophical Perspectives, 2014.(self) 8 [Book] Punishment and Social Structure by Rusche and Kirchheimer(self) 3 [Article] A Strong Leader for A Time of Crisis: Xi Jinping’s Strongman Politics as A Collective Response to Regime Weakness(self) 1 [Book] Nünning, Ansgar and Carola Surkamp - Englische Literatur unterrichten I: Grundlagen und Methoden(self) 2 [Article] Multicultural attitudes and cultural intelligence of preschool teachers, by Çağrı Peköz, Ayşe Işık Gürşimşek , 2020(self) 4 [Book] Statistics for Business and Economics, 4th Edition, 2017, David Anderson, Dennis Sweeney, Thomas Williams, Jim Freeman, Eddie Shoesmith(self) 4 [Article] Evaluation of Occupant Loading in Low- to Moderate-Speed Frontal and Rear-End Motor Vehicle Collisions(self) 1 [Book] Theories of Multiculturalism by George Crowder(self) 6 [BOOK] A Dictionary of Critical Theory (2nd Ed.) by Ian Buchanan(self) 0 "The People’s Charter and the Enigmatic Mr. Maltman Barry", by Paul Martinez (1980) [Article](self) 4 [Book] Rössner, Philipp (ed) 2015 On Commerce and Usury (1524) by Martin Luther. Anthem Press.(self)NSFW 4 [Article] Electronic documents give reproducible research a new meaning(self) 1 [ARTICLE] A Three Square Geometry Problem by Charles Trigg(self) 1 [BOOK] Structure And Mechanism In Protein Science: A Guide To Enzyme Catalysis And Protein Folding (Structural Biology) Reprint Edition(self) 1 [BOOK] Genetic Analysis: Genes, Genomes, and Networks in Eukaryotes 2nd Edition by Philip Meneely(self) 2 [Article] Ultimate Strength Design of Reinforced Concrete Chimmneys. Rumman, W.S., and Sun, R. Y.,1977(self) 1 [book] Signs of civilisation : the characters that changed Europe(self) 1 [Book] Social Class : How Does It Work? by Annette Lareau; Dalton Conley(self) 1 [book] Garner's Dictionary of Legal Usage Third Edition(self) 1 [book] The Integration of MILLION into the English System of Number Words(self) 1 [Book] Connected Speech: The Interaction of Syntax and Phonology - Ellen Kaisse(self) 2 [BOOK] Statistics Using R: An Integrative Approach(self) 4 [Article] Rethinking International Institutionalisation through Treaty Organs by Gloria Fernández Arribas(self) 1 [Book] Parasitic Gaps - Peter W. Culicover and Paul M. Postal(self) 4 [Book] The Global Economy A Concise History Edited By Franco Amatori, Andrea Colli(self) 7 [Article] "Sorting out the ethics of propaganda", Stanley Cunningham(self) 1 [Book] Diet, Life-Style, and Mortality in China: A Study of the Characteristics of 65 Chinese Counties(self) 2 [Article] “Some Degenerate Entrepreneur Fleeing From a Medicine Show”: Judge Holden in The Age of P.T. Barnum(self) 4 [Article] Christoph Witzel and Matteo Toscani, "How to make a #theDress," J. Opt. Soc. Am. A 37, A202-A211 (2020)(self) 4 [Article] [Heinonline] The Emergence and Fallacy of 'China's Debt-Trap Diplomacy' Narrative(self) 5 [Article] [Heinonline] US-Philippines Defense Cooperation during the Duterte Administration: Adjustments and Limitations(self) 8 [Supplement] Polariton Z Topological Insulator, A. V. Nalitov, D. D. Solnyshkov, and G. Malpuech(self) 4 [BOOK] HILL, Christopher. Intellectual Origins of the English Revolution - Revisited.(self) 11 [Article] Post-National Citizenship in Europe: The EU as a Welfare Rights Generator, by Marlene Wind.(self)NSFW 4 [Chapter] The Russian and Chinese Revolutions Compared S. A. Smith from The Oxford Handbook of Modern Russian History(self) 2 [Book] Beyond the Annual Budget: Global Experience with Medium Term Expenditure Frameworks(self) 1 [Book] How Art Can Be Thought: A Handbook for Change - Allan deSouza(self) 1 [Article] Surgical treatment of neuromuscular scoliosis: current techniques(self) 5 [Chapter] Desire, Mimetic Theory, and Original Sin(self) 1 [Book] Dayen, David 2020 Monopolized Life: in the Age of Corporate Power. The New Press.(self) 1 [book] Penetrating Language A Critical Discourse Analysis of Pornography(self) 1 [book] Presentation in Language: Rethinking Speech and Writing(self) 4 [Article] Can someone find the full article for me?(self) 1 [BOOK] Genera Palmarum: the evolution and classification of palms by John Dransfield and Natalie W. Uhl(self) 1 [book] Orthography, Variation, and the Creation of Meaning in Written Japanese(self) 4 [Chapter] The Relative Cycle in Hungarian Declaratives, Julia Bacskai-Atkari(self) 1 [Article] Involvement of MicroRNA Mir15a in Control of Human Ovarian Granulosa Cell Proliferation, Apoptosis, Steroidogenesis, and Response to FSH(self) 1 [Chapter], in Violence in War and Peace: An Anthology by Nancy Scheper-Hughes & Philippe Bourgois (Editors)(self) 1 [Chatper], in Violence in War and Peace: An Anthology by Nancy Scheper-Hughes & Philippe Bourgois (Editors)(self) 1 [book] Oxford Dictionary of Proverbs (6 ed.)(self) 1 [Book] The Origins of the First World War ByJames Joll, Gordon Martel(self) 4 [Chapter] The Feminist Standpoint Theory Reader: Intellectual and Political Controversies(self) 4 [BOOK] Early Events in Monocot Evolution by Paul Wilkin and Simon J. Mayo(self) 5 [Book] BRIGGS, Robin. "Communities of Belief: Cultural and Social Tensions in Early Modern France"(self) 2 [Article] Transgenerational Epigenetics: A Window into Paternal Health Influences on Offspring(self) 3 [Thesis] Earthquake risk assessment of building structures(self) 1 [Article] Factors associated with women achieving and maintaining abstinence from alcohol: a rapid evidence assessment(self) 1 [Thesis/Article] Earthquake risk assessment of building structures(self) 1 [BOOK] Censorship and Propaganda in World War I, 2019(self) 3 [article] A new device producing ambulatory intermittent pneumatic compression suitable for the treatment of lower limb oedema: A preliminary report(self) 1 [Article] Kinetic Modeling and Optimization of the Release Mechanism of Curcumin from Folate Conjugated Hybrid BSA Nanocarrier(self) 1 [Article] Lawrence Transfer Factor: Transference of Specific Immune Memory by Dialyzable Leukocyte Extract from a CD8+ T Cell Line(self) 1 [Book] he Origins of the First World War William Mulligan(self) 1 2 [Article] Biteye: A System for Tracking Bitcoin Transactions(self) 1 [BOOK] A Photographic Atlas of Developmental Biology. 2005. Shirley J. Wright. Morton.(self) 4 [Other] Philippine Daily Inquirer July 16, 2020(self) 1 [BOOK] Letters on Familiar Matters, Volume 1 by Francesco Petrarch(self) 2 [Article] Optical fiber micro-devices made with femtosecond laser by Kaiming Zhou, Fangcheng Shen, Guolu Yin, and Lin Zhang(self) 3 [BOOK] Need a book from Oxford Scholarship online: The Oxford Francis Bacon Vol. 6(self) 1 [BOOK] I need OBSERVATIONAL ASTRONOMY by D. Scott Birney(self) 4 [Article] Homeostatic Plasticity Shapes the Retinal Response to Photoreceptor Degeneration by Shen, Wang, Soto and Kerchensteiner.(self) 1 [Artikel] Homeostatic Plasticity Shapes the Retinal Response to Photoreceptor Degeneration by Shen, Wang, Soto and Kerchensteiner(self) 3 [Article][Request] Anyone have access to this article?(self) 7 [Article] The idea that everything from spoons to stones is conscious is gaining academic credibility (Quartz)(self) 2 [Article](self) 1 [BOOK] Need a german book from JSTOR, "Politisches Skandalmanagement: Strategien der Selbstverteidigung in politischen Affären der Bundesrepublik Deutschland "(self) 1 [BOOK] The Oxford Handbook of Ethics of AI(self) 1 [ARTICLE] Are natural scientists more masculine than humanists? The association patterns between 2D:4D ratio and field of study by Kainz, Sarah; Weitzer, Jakob; Zingale, Stefania; Köllner, Johanna; Albrecht, Cornelia; Gaidora, Angelika; Rudorfer, Marie-Theres; Nürnberger, Anna; Kirchengast, Sylvia(self) 1 [Book] The Crisis of Criticism - Maurice Berger (editor)(self) 2 [Book] Handbook of Nonprescription Drugs: An Interactive Approach to Self-Care, 19th Edition(self) 1 [Book] 'Le discours pornographique' Marie-Anne Paveau, La Musardine, 2014(self) 8 [Article] Allocation and Operation of A Hydropneumatic Energy Storage with Building Microgrid(self) 1 [ARTICLE] L'information internationale en Amérique du Sud: les agences et les réseaux, circa 1874-1919, 2013(self) 1 [Book] The Beaultiful Fall: Fashion, Genius and Glorious Excess in 1970s Paris, Alicia Drake(self) 4 [BOOK] 'Sociology and the Sacred: An Introduction to Philip Rieff's Theory of Culture' Antonius A.W. Zondervan, University of Toronto Press, 2005(self) 1 [Article] Flavell, J. (1987). Speculations about the nature and development of metacognition. In F. Weinert & R. Kluwe (Ed.), Metacognition, motivation, and understanding (p. 21-29). Hillsdale, NJ: Lawrence Erlbaum.(self) 1 [Book] Health Policy Management: A Case Approach 1st Edition(self) 3 [BOOK] Visions and Ideas of Europe during the First World War, 2019(self) 4 [Article] Opioids After Surgery in the United States Versus the Rest of the World The International Patterns of Opioid Prescribing (iPOP) Multicenter Study by Kaafarani, Haytham M. A. MD, MPH*; Han, Kelsey BSc*; El Moheb, Mohamad MD et al(self) 1 [ARTICLE] "Who Is This?" Narration of the Divine Identity of Jesus in Matthew 21:10—17, Andrew E. Nelson(self) 2 [Book] Origins of value: The financial innovations that created modern capital markets(self) 1 [Article] Automation of in-hospital pharmacy dispensing: a systematic review by Sarah Batson, Ana Herranz, Nicolas Rohrbach, Michela Canobbio, Stephen A Mitchell, Pascal Bonnabry(self) 1 [Book] Manual of Pediatric Balance Disorders - Robert C. O'Reilly(self) 1 [Article] Primary adrenal failure and central nervous system lesions: a rare case report of primary adrenal lymphoma by Cristina P. Correia, José G. Freitas, António Martins, Jorge Oliveira(self) 1 [Book] Portable Literature: Reading, Reacting, Writing(self) 5 [BOOK] Lawfare: Law as a Weapon of War - Orde F. Kittrie(self) 3 [Article] Dismantling Restrictive Gender Norms: Can Better Designed Paternal Leave Policies Help? by Negar Omidakhsh, Aleta Sprague, & Jody Heymann(self) 1 [BOOK] Modernization from the Other Shore: American Intellectuals and the Romance of Russian Development by David Engerman(self) 1 [Article] Torsional Response of Reinforced Fibrous Concrete Beams(self) 1 [Book] Language change by Joan Bybee(self) 1 [Book] [Taylor and Francis] The Routledge Handbook of North American Languages(self) 3 [Thesis] "Gas-Surface Desorption and Scattering Processes: Development and Application of the Random Corrugation Model"(self) 1 [Book] Reinventing the Museum: The Evolving Conversation on the Paradigm Shift (2nd Edition)(self) 1 [BOOK] When Police Kill - Franklin Zimring(self) 1 [article] DNA Vaccine Delivery and Improved Immunogenicity Kevin R. Porter and Kanakatte Raviprakash(self) 7 [BOOK] 'The Triumph of the Therapeutic: Uses of Faith after Freud', Philip Rieff, 1973(self) 1 [book] Verbs, Clauses and Constructions: Functional and Typological Approaches(self) 6 [Book] Special Duty: A History of the Japanese Intelligence Community by Richard J. Samuels(self) 7 [BOOK] The Right to Know: Transparency of an Open World by Ann Florini(self) 4 [BOOK] At Home in Two Countries: The Past and Future of Dual Citizenship by Peter J Spiro(self) 1 [BOOK] 'Mesolithic Europe' Geoff Bailey & Penny Spikins, 2008/2010(self) 7 [BOOK] 'Nietzsche and the Clinic: Psychoanalysis, Philosophy, Metaphysics' Jared Russell, 2017(self) 1 [book] Lexical Properties of Selected Non-native Morphemes of English(self) 4 [BOOK] 'Wild Things: Recent advances in Palaeolithic and Mesolithic research' Frederick W. F. Foulds, 2014(self) 2 [Article] Thoracoabdominal Aneurysm Surgery(self) 1 [BOOK] Research handbook on climate governance(self) 2 [Book] High-Performance Compilers for Parallel Computing by Michael Wolfe(self) 3 [Article] Cosmic Cinema: On the Philosophical Films of Terrence Malick(self) 3 [Book] Critical thinking about research.(self) 6 [Supplement] Transposable elements in mammals promote regulatory variation and diversification of genes with specialized functions, Louie N.van de Lagemaat Josette-RenéeLandry Dixie L.MagerPatrikMedstrand(self) 1 [BOOK] Crisis Elections, New Contenders and Government Formation. Breaking the Mould in Southern Europe - Anna Bosco & Susannah Verney(self) 4 [Article] Legal and Ethical Imperatives for Using Certified Sign Language Interpreters in Health Care Settings(self) 5 [Article] Bottles and Bricks: Rethinking the Prohibition against Violent Political Protest by Jennifer Kling & Megan Mitchell(self) 6 [Book] Corruption in International Investment Arbitration - Aloysius Llamzon(self) 5 [Article] Sports prediction and betting models in the machine learning age: The case of Tennis, Wilkes 2019.(self) 1 [chapter] Handwriting Recognition Systems and Applications(self) 3 [Article] Designing robust policies under deep uncertainty for mitigating epidemics, Siddhartha Paul, Jayendran Venkateswaran(self) 4 [ARTICLE] IJSSSP: TLS Certificates of the Tor Network and Their Distinctive Features(self) 1 [Book] Methods in Yeast Genetics and Genomics, 2015 Edition: A CSHL Course Manual(self) 3 [Article] Optically improved mitochondrial function redeems aged human visual decline(self) 4 [ARTICLE] Getting Involved with Time: Notes on the Analysis of a Schizoid Man (PROQUEST)(self) 7 [Book] URGENT If you have access to Project MUSE please help me with finding the pdf of "Where is Ana Mendieta"(self) 4 [Book] Rites, rights and rhythms: a genealogy of musical meaning in Colombia's black pacific by Michael Birenbaum Quintero(self) 1 [BOOK] Corrupt Research: The Case for Reconceptualizing Empirical Management and Social Science by Raymond Hubbard(self) 4 [Thesis] Protecting education from attack: Humanitarian agencies and the implementation of a new global norm in the case of Palestine (Proquest)(self)NSFW 3 [Chapter] from A History of the Soviet Union From the Beginning to Its Legacy By Peter Kenez chapter 11,12,13(self) 2 [Article] The effects of NBPTS‐certified teachers on student achievement + Douglas N. Harris Tim R. Sass(self) 5 [Book] Nietzsche and Contemporary Ethics - Simon Robertson(self) 1 [Book] Smolensk Under the Nazis: Everyday Life in Occupied Russia(self) 1 [Article] [Ingenta] A Study on the Complementary Economy of China and the Philippines Under the New Normal Situation (2010-2016) by Zhu Bin and Jing Lei(self) 4 [Article] Weavers, Merchants and Company: The Handloom Industry in Southeastern India 1750-1790 by S. Arasaratnam(self) 1 [BOOK] Legacies of the Left Turn in Latin America: The Promise of Inclusive Citizenship - Manuel Balán & Françoise Montambeault(self) 6 [Article] Autonomous industrial mobile manipulation (AIMM): past, present and future. Author: Mads Hvilshøj, Simon Bøgh, Oluf Skov Nielsen, Ole Madsen.(self) 1 Removed: Pending moderation REQUEST [eBook] The Assessment Book – Physiotutors Guide to Orthopedic Physical Assessment(self) 1 [Article] [Brill] The Tragedy of Small Power Politics: The Philippines in the South China Sea by Charmaine Misalucha-Willoughby and Robert Joseph Medillo(self) 1 [BOOK] Echo and Reverb: Fabricating Space in Popular Music Recording, 1900-1960(self) 5 [Article] EFFECTS OF HIGH CONCENTRATIONS OF PLANT OILS AND FATTY ACIDS FOR MYCELIAL GROWTH AND PINHEAD FORMATION OF HERICIUM ERINACEUM(self) 1 [Article] [HeinOnline] "Disposable Deontology: The Death Penalty" by Tung Yin(self) 2 [Article] Efficient conversion of pretreated brewer’s spent grain and wheat bran by submerged cultivation of Hericium erinaceus(self) 1 [Chapter] The Imperial Institute: The state and the development of the natural resources of the Colonial Empire, 1887–1923(self) 1 [Book] Pieter Steyn - Zapuphizo: Voice of the Nagas(self) 3 [Article] Critical Constructivism and Postphenomenology: Ethics, Politics, and the Empirical(self) 5 [BOOK] Political Populism: A Handbook - Reinhard C. Heinisch, Christina Holtz-Bacha, Oscar Mazzoleni (Ed.)(self) 1 [BOOK] Effective Strategies for Protecting Human Rights(self) 4 [BOOK] The Unprovability of Consistency - George Boolos(self) 1 [BOOK] 'The Unity of Hegel's Phenomenology of Spirit: A Systematic Interpretation' Jon Stewart, Northwestern University Press (2000)(self) 1 [Book] Campus Wars by Kenneth J Heineman(self) 3 [Article] Circuit Theory for Waveguiding, Robert E. Collin(self) 1 [Other] [UpToDate] Attention deficit hyperactivity disorder in adults: Epidemiology, pathogenesis, clinical features, course, assessment, and diagnosis(self) 2 [BOOK] Quark-Gluon Plasma: From Big Bang to Little Bang(self) 10 [Book] The Representation of (in)definiteness - It's on archive.org but I can't seem to be able to download it(self) 1 [Book] Aginid bayok sa atong tawarik(self) 1 [Book] Political Economy In Macro Economics By Allan Drazen and Political Control of the Economy By Edward R. Tufte(self) 4 [Book] The Routledge Companion to Animal-Human History(self) 4 [Article] Inventing Brands: Opportunities at the Nexus of Semiotics and Intellectual Property by Conley, J. G.(self) 6 [Chapter] MULTICULTURALISM, OR, THE CULTURAL LOGIC OF MULTINATIONAL CAPITALISM by Slavoj Zizek(self) 5 [Article] Value articulation : A framework for the strategic manage- ment of intellectual property by Conley, James G., Peter M.Bican, and Holger Ernst(self) 3 [Book](JSTOR)Why We Believe: Evolution and the Human Way of Being by Agustin Fuentes(self) 1 [Book](self) 1 [Book] Ottoman Explorations of the Nile: Evliya Çelebi’s Map of the Nile and The Nile Journeys in the Book of Travels (Seyahatname) - Dankoff, Tezcan & Sheridan(self) 1 [Article] The Jewels of Adad by FNH Al-Rawi, JA Black(self) 1 [article] A measurement of collective learning effects in Italian high-tech milieux(self) 1 [Article] Parasympathetic activity is reduced during slow-wave sleep, but not resting wakefulness, in patients with chronic fatigue syndrome - Fatt et al., 2020(self) 1 [Book] Linked Data for Libraries, Archives, and Museums, by Seth van Hooland and Ruben Verborgh(self) 4 [Book] The Oxford Handbook of Well-Being and Public Policy - Edited by Matthew D. Adler and Marc Fleurbaey(self) 4 [Book] The Ostrich Communal Nesting System(self) 1 [Article] Protracted Effects of Ketamine Require Immediate Kappa Opioid Receptor Activation and Long‐Lasting Desensitization - Jacobson et al., 2020(self) 1 [Book] The Routledge Handbook to the Political Economy and Governance of the Americas by Olaf Kaltmeier et al.(self) 1 [Article] Dispute Resolution Provisions of the Energy Charter by Philippe Pinsolle(self) 1 [Book] Regional Development and Planning for the 21st Century New Priorities, New Philosophies(self) 4 [BOOK] Need a book from Oxford Scholarship online on International law subject.(self) 1 [Book] Prehispanic Settlement Patterns in the Upper Mantaro and Tarma Drainages, Junín, Peru: Volume 2, The Wanka Region(self) 4 [Book] Varieties of Virtue Ethics - David Carr, James Arthur, Kristján Kristjánsson(self) 4 [Article] Combustion Characteristics of a Swirled Burner Fueled With Waste Cooking Oil(self) 1 [BOOK] 'Beyond pleasure : Freud, Lacan, Barthes' by Margaret Iversen(self) 5 [Article] Empirical Studies of Adolescent Sexual Behavior: A Critical Review(self) 3 [Article]The sexual attitudes, behavior, and relationships of women with histrionic personality disorder(self) 2 Midsommar: Thing Theory [Article](self) 6 [Article] Microdosing psychedelics as cognitive and emotional enhancers.(self) 1 [Book] (Taylor&Francis) Human Evolution An Introduction to Man's Adaptations by Bernard Campbell(self) 1 [Article] Changing settlement patterns in the upper Mantaro Valley, Peru(self) 1 [BOOK] Fighting for Abortion Rights in Latin America Social Movements, State Allies and Institutions - Cora Fernández Anderson(self) 1 [Chapter] from the book The Crimean War: 1853–1856 Winfried Baumgart chapter 1 , 3 ,18(self) 1 [Book] Models of Integrity: Art and Law in Post-Sixties America -Joan Kee(self) 3 [Article] Forensic medical evaluation of children who present with suspected sexual abuse: How do we know what we know? by Grace Wong(self) 4 [book] Grammatical Voice — Fernando Zúñiga and Seppo Kittilä(self) 2 [Article]Naturally occurring 5′ preS1 deletions markedly enhance replication and infectivity of HBV genotype B and genotype C (supplementary materials)(self) 1 [Book] Commercial Real Estate Analysis and Investments (International) 3rd Edition(self) 2 [Book] Best Practices Guide to Residential Construction: Materials, Finishes, and Details by Steven Bliss(self) 2 [Book] Green Logistics: Improving the Environmental Sustainability of Logistics(self) 1 [Article] Black Codes and Slave Codes by Nakia D. Parker(self) 1 [Book] Marsh's Becoming a Teacher(self) 4 [Book] Germans Against Nazism: Nonconformity, Opposition and Resistance in the Third Reich: Essays in Honour of Peter Hoffmann by Francis R. Nicosia and Lawrence D. Stokes(self) 4 [Chapter] The Standard Story and Its Rivals(self) 1 [BOOK]Agrarian and Other Histories Essays for Binay Bhushan Chaudhuri - Edited by Shubhra Chakrabarti and Utsa Patnaik(self) 1 [Book] Regional modernities : the cultural politics of development in India. Ed. K. Sivaramakrishnan; Arun Agrawal(self) 1 [Chapter] Damping in Structures(self) 1 [Book] Gerontología y geriatría: valoración e intervención. Editorial Médica Panamericana. José Carlos Millán-Calentí(self) 1 [Book] Lotman's Cultural Semiotics and the Political - Makarychev & Yatsyk (2017)(self) 2 [Book] (Brill) The Handbook of Austroasiatic Languages (2 vols)(self) 1 [Book] Indian Films in Soviet Cinemas: The Culture of Movie-going After Stalin by Sudha Rajagopalan(self) 4 [BOOK] Decolonizing Theory: Thinking across Traditions by Aditya Nigam (1st edition, Bloomsbury India)(self) 3 [Request] [Article] Cell-by-Cell Deconstruction of Stem Cell Niches(self) 1 [Book] Social research methods- fifth edition, Bryman, Alan (2016)(self) 4 [Book]Chinese and Indian Warfare – From the Classical Age to 1870(self) 1 [Book] PC-Forensik Christoph Willer(self) 1 [Book] Designing for Empathy: Perspectives on the Museum Experience(self) 4 [book] American Communism and Black Americans by Philip Foner(self) 4 [Book] Marcus Franke : War and Nationalism in South Asia The Indian State and the Nagas(self) 8 [BOOK] Natural Resources, Extraction and Indigenous Rights in Latin America. Exploring the Boundaries of Environmental and State-Corporate Crime in Bolivia, Peru, and Mexico(self) 1 [Book] International Human Rights Law (3rd edn) Edited by Daniel Moeckli - Oxford University Press(self) 4 [Book] Participatory Heritage, Edited by Henriette Roued-Cunliffe , Andrea Copeland(self) 4 [BOOK] Political Representation in Southern Europe and Latin America Before and After the Great Recession and the Commodity Crisis - André Freire, Mélany Barragán, Xavier Coller, Marco Lisi, Emmanouil Tsatsanis(self) 4 [BOOK] Latin America and Policy Diffusion From Import to Export - Osmany Porto de Oliveira, Cecilia Osorio Gonnet, Sergio Montero, Cristiane Kerches da Silva Leite(self) 0 [Book] Sexual behaviour in Britain: The National Survey of Sexual Attitudes and Lifestyles (1994)(self) 1 [book] Studien zur Hirnpathologie und Psychologie - Pick, Arnold(self) 4 [Other] Special Issue, Blockchain innovation and public policy, Journal of Entrepreneurship and Public Policy: Volume 9 Issue 2(self) 4 [BOOK] baby jails: the fight to end the incarceration of refugee children in america/ jstor account??(self) 1 [Journal] Special Issue: Blockchain innovation and public policy, Journal of Entrepreneurship and Public Policy, Volume 9, Issue 2(self) 1 [Book] Blackstone's EU Treaties and Legislation 2019-2020 (20th ed)(self) 3 [article] Deep Graph Kernels(self) 5 [Book] Routledge Handbook of the South Asian Diaspora - By Joya Chatterji, David Washbrook(self) 4 [Book] Growth and distribution(self) 1 [BOOK] The Radical Left in Europe in the Age of Austerity - Babak Amini(self) 4 [Book] Political Myth by Christopher Flood (Routledge) (2002)(self) 2 [Article] Robotic Assisted Radical Cystectomy vs Open Radical Cystectomy: Systematic Review and Meta-Analysis + Niranjan J Sathianathen et al(self) 1 [Book] Folk Art Potters of Japan Beyond an Anthropology of Aesthetics (Routledge) by Brian Moeran(self) 1 [book] Revolution: How the Bicycle Reinvented Modern Britain(self) 5 [BOOK] Radical Left Movements in Europe - Magnus Wennerhag, Christian Fröhlich, Grzegorz Piotrowski(self) 4 [BOOK] Party System Change, the European Crisis and the State of Democracy - Marco Lisi(self) 5 [BOOK] Routledge Handbook of Contemporary European Social Movements. Protest in Turbulent Times - Cristina Flesher Fominaya, Ramon A. Feenstra(self) 4 [Book] Attorney-Client Privilege in International Arbitration(self) 1 [Article] An Alternative Ontology of Food Beyond Metaphysics by Lisa Heldke. Published in Radical Philosophy Review, Vol 15, Issue 1, 2012(self) 1 [Book] Bello, Walden 2005 Dilemmas of Domination: The Unmaking of the American Empire. Zed Books, 2005.(self) 1 [Article] Owning the PastOwning the Past Reply to Stokes(self) 1 [Article] Owning the PastOwning the Past Reply to Stokes(self) 1 [Book] McQuire, Scott. Crossing the Digital Threshold. Brisbane: Australian Key Centre for Cultural and Media Policy, Faculty of Humanities, Griffith University, 1997.(self) 3 [Book] Request: Migration and the Refugee Dissensus in Europe: Borders, Security and Austerity by Nicos Trimikliniotis.(self) 9 [Article] Masculinity in videogames: the gendered gameplay of Silent Hill(self) 1 [BOOK] 'Truth games : lies, money, and psychoanalysis' by John Forrester, Harvard University Press, 2000(self) 1 [Book] Osterloh, Jörg, und Clemens Vollnhals. NS-Prozesse Und Deutsche Öffentlichkeit: Besatzungszeit, Frühe Bundesrepublik Und DDR.(self) 2
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Bitcoin risk analysis using machine learning BEST MINING-BITCOIN HACK 2019 Live Bitcoin Machine Learning - YouTube Bitcoin Basics (Part 1) - Predicting Bitcoin Price with LSTM

Machine learning methods to detect money laundering in the Bitcoin blockchain in the presence of label scarcity Joana Lorenz [email protected] NOVA IMS & Feedzai Maria Inês Silva [email protected] Feedzai David Aparício [email protected] Feedzai João Tiago Ascensão [email protected] Feedzai Pedro Bizarro pedro ... In this project, we attempt to apply machine-learning algorithms to predict Bitcoin price. For the first phase of our investigation, we aimed to understand and better identify daily trends in the Bitcoin market while gaining insight into optimal features surrounding Bitcoin price. Our data set consists of over 25 features relating to the Bitcoin price and payment network over the course of ... of Bitcoin can be predicted using machine learning methods. This is fundamentally a time series prediction problem. While much research exists surrounding the use of dif-ferent machine learning techniques for time series prediction, research in this area relat-ing speci cally to Bitcoin is lacking. In ad-dition, Bitcoin as a currency is in a ... to buy or sell at the best offered price. As bitcoin is traded around the world, unlike a stock or currency it is minimally affected by an individual corporation or the economic condition of a single coun-try. This insulation from outside information makes bitcoin an ideal platform for trading through machine learning as the bitcoin price Book Name: Learning Bitcoin Author: Richard Caetano ISBN-10: 1785287303 Year: 2015 Pages: 236 Language: English File size: 13.7 MB File format: PDF, ePub. Learning Bitcoin Book Description: The financial crisis of 2008 raised attention to the need for transparency and accountability in the financial world.

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Bitcoin risk analysis using machine learning

Bitcoin: Logarithmic regression, market cycle ROI, price stabilization & more (a month in review) - Duration: 33:39. Benjamin Cowen 11,103 views We Start The Beta Test for Machine Learning For Bitcoin to predict the future of Movement Long or short Dominic Spencer, Mengying Li, Yuda Song Predicting Bitcoin Price with LSTM Cognitive Science Introduction ot Machine Learning II, Final project Fall 2017 Prof: Virgina De Sa. We Start The Beta Test for Machine Learning For Bitcoin to predict the future of Movement Long or short l'étalon bitcoin pdf l'express bitcoin l'avenir du bitcoin l'histoire du bitcoin ... bitcoin mining machine m bitcoin meaning m.bitcoin 2048 bitcoins for.me bitcoin m-pesa bitcoin m of n

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